Annual report pursuant to Section 13 and 15(d)

Business and Summary of Significant Accounting Principles (Cash Flow Statements Immaterial Error Correction) (Details)

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Business and Summary of Significant Accounting Principles (Cash Flow Statements Immaterial Error Correction) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Net income $ 9,162 $ 5,486 $ 8,610
Depreciation and amortization expense 130,452 125,937 126,699
Income tax expense 12,088 7,405 9,248
Scenario As Previously Reported [Member]
      
Net income   5,601 8,955
Depreciation and amortization expense   125,742 126,114
Income tax expense   7,485 9,488
Adjustment [Member]
      
Net income   (115) (345)
Depreciation and amortization expense   195 585
Income tax expense   $ (80) $ (240)