Quarterly report pursuant to Section 13 or 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
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Net income (loss) $ 3,805 $ (2,044) $ 5,057 $ (645)
Depreciation and amortization expense 33,350 30,779 65,730 62,645
Income tax (expense) benefit (3,968) 2,067 (5,117) 676
Scenario As Previously Reported [Member]
        
Net income (loss)   (1,957)   (472)
Depreciation and amortization expense   30,632   62,352
Income tax (expense) benefit   (2,007)   (556)
Adjustment [Member]
        
Net income (loss)   (87)   (173)
Depreciation and amortization expense   147   293
Income tax (expense) benefit   $ (60)   $ (120)