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Business and Summary of Significant Accounting Principles (Narratives) (Details) (USD $)
Share data in Thousands, unless otherwise specified |
3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Sep. 30, 2014
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Sep. 30, 2013
|
Sep. 30, 2014
entity
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Sep. 30, 2013
|
Dec. 31, 2013
|
Sep. 30, 2014
Total High Cost Support Program [Member]
|
Sep. 30, 2013
Total High Cost Support Program [Member]
|
Sep. 30, 2014
Total High Cost Support Program [Member]
|
Sep. 30, 2013
Total High Cost Support Program [Member]
|
Sep. 30, 2014
Common Stock - Class A [Member]
|
Sep. 30, 2013
Common Stock - Class A [Member]
|
Jul. 22, 2013
ACS [Member]
|
Sep. 30, 2014
Stock Buyback Program [Member]
|
Sep. 30, 2014
Stock Buyback Program [Member]
Common Stock - Class A [Member]
|
Sep. 30, 2013
Stock Buyback Program [Member]
Common Stock - Class A [Member]
|
Sep. 30, 2014
Stock Buyback Program [Member]
Common Stock - Class A [Member]
|
Sep. 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% | ||||||||||||||||
| Common Stock | |||||||||||||||||
| Authorized amount, repurchase of stock | $ 5,000,000 | $ 5,000,000 | |||||||||||||||
| Stock repurchased during period, shares | 148 | 1,795 | 100 | 200 | 100 | 1,700 | |||||||||||
| Stock repurchased during period, value | 1,972,000 | 15,388,000 | 1,972,000 | 15,518,000 | 1,300,000 | 2,200,000 | 1,300,000 | 15,100,000 | |||||||||
| Stock repurchase program, remaining value authorized to be repurchased | 120,000,000 | ||||||||||||||||
| Accounts Receivable and Allowance for Doubtful Receivables | |||||||||||||||||
| Period past due for write-off of trade accounts receivable | 120 days | ||||||||||||||||
| Revenue Recognition | |||||||||||||||||
| Revenues | 240,725,000 | 217,943,000 | 681,407,000 | 593,820,000 | 16,500,000 | 14,900,000 | 50,000,000 | 36,000,000 | |||||||||
| Receivables | $ 222,405,000 | $ 222,405,000 | $ 228,372,000 | $ 47,200,000 | $ 47,200,000 | ||||||||||||