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 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Net income $ 3,523 $ 7,239 $ 8,580 $ 6,594
Depreciation and amortization expense 32,120 30,653 97,850 93,298
Income tax expense (5,270) (7,979) (10,387) (7,303)
Scenario As Previously Reported [Member]
        
Net income   7,210   6,738
Depreciation and amortization expense   30,702   93,054
Income tax expense   7,959   7,403
Adjustment [Member]
        
Net income   29   (144)
Depreciation and amortization expense   (49)   244
Income tax expense   $ 20   $ (100)