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)