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Business and Summary of Significant Accounting Principles (Narratives) (Details) (USD $)
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3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
entity
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Jun. 30, 2013
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Dec. 31, 2013
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Jun. 30, 2014
Total High Cost Support Program [Member]
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Jun. 30, 2013
Total High Cost Support Program [Member]
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Jun. 30, 2014
Total High Cost Support Program [Member]
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Jun. 30, 2013
Total High Cost Support Program [Member]
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Jun. 30, 2014
Common Stock - Class A [Member]
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Jun. 30, 2013
Common Stock - Class A [Member]
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Jul. 22, 2013
ACS [Member]
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Jun. 30, 2014
Stock Buyback Program [Member]
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Jun. 30, 2013
Stock Buyback Program [Member]
Common Stock - Class A [Member]
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Jun. 30, 2013
Stock Buyback Program [Member]
Common Stock - Class A [Member]
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| Business | |||||||||||||||
| Year founded | 1979 | ||||||||||||||
| Principles of Consolidation | |||||||||||||||
| Number of VIEs | 4 | ||||||||||||||
| Acquisition | |||||||||||||||
| Percentage of voting interests acquired | 66.66% | ||||||||||||||
| Earnings Per Share | |||||||||||||||
| Shares contingently issuable | 0 | 50,000 | |||||||||||||
| Common Stock | |||||||||||||||
| Authorized amount, repurchase of stock | $ 5,000,000.0 | ||||||||||||||
| Stock repurchased during period, shares | 29,000 | 1,538,000 | 735,000 | 1,500,000 | |||||||||||
| Stock repurchased during period, value | 536,000 | 13,062,000 | 536,000 | 13,192,000 | 6,300,000 | 12,900,000 | |||||||||
| Stock repurchase program, remaining value authorized to be repurchased | 116,100,000 | ||||||||||||||
| Accounts Receivable and Allowance for Doubtful Receivables | |||||||||||||||
| Period past due for write-off of trade accounts receivable | 120 days | ||||||||||||||
| Revenue Recognition | |||||||||||||||
| Revenues | 224,399,000 | 189,661,000 | 440,682,000 | 375,877,000 | 17,000,000 | 10,500,000 | 33,500,000 | 21,100,000 | |||||||
| Receivables | $ 203,550,000 | $ 203,550,000 | $ 228,372,000 | $ 47,400,000 | $ 47,400,000 | ||||||||||