(Statements of Operations (Unaudited)) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Revenues	$ 239,034	$ 229,670
Operating Costs	154,090	149,605
Costs and expenses:
Depreciation and amortization	45,526	46,285
General and administrative	24,483	23,054
Intercompany leasing	0	0
Bad debt expense (recovery)	(124)	281
Total costs and expenses	223,975	219,225
Income (loss) from operations	15,059	10,445
Other (expense) income:
Equity in earnings of subsidiaries	0	0
Interest expense	(12,388)	(11,462)
Loss on extinguishment of debt	(7,887)	0
Other	2,674	(821)
Total other expense	(17,601)	(12,283)
Income (loss) before income taxes	(2,542)	(1,838)
Income tax (expense) benefit	(37)	546
Net income (loss)	(2,579)	(1,292)
Parent [Member]
Revenues	0	0
Operating Costs	0	0
Costs and expenses:
Depreciation and amortization	269	252
General and administrative	6,735	5,426
Intercompany leasing	0	0
Bad debt expense (recovery)	0	0
Total costs and expenses	7,004	5,678
Income (loss) from operations	(7,004)	(5,678)
Other (expense) income:
Equity in earnings of subsidiaries	12,885	9,189
Interest expense	(12,399)	(11,449)
Loss on extinguishment of debt	(7,887)
Other	2,879	1
Total other expense	(4,522)	(2,259)
Income (loss) before income taxes	(11,526)	(7,937)
Income tax (expense) benefit	(8,947)	(6,645)
Net income (loss)	(2,579)	(1,292)
Guarantor Subsidiaries [Member]
Revenues	216,870	198,895
Operating Costs	139,487	129,216
Costs and expenses:
Depreciation and amortization	41,864	42,702
General and administrative	17,198	16,978
Intercompany leasing	(1,215)	(1,215)
Bad debt expense (recovery)	(124)	281
Total costs and expenses	197,210	187,962
Income (loss) from operations	19,660	10,933
Other (expense) income:
Equity in earnings of subsidiaries	575	2,342
Interest expense	7	(20)
Loss on extinguishment of debt	0
Other	671	283
Total other expense	1,253	2,605
Income (loss) before income taxes	20,913	13,538
Income tax (expense) benefit	8,028	4,349
Net income (loss)	12,885	9,189
Non-Guarantor Subsidiaries [Member]
Revenues	22,164	30,775
Operating Costs	14,603	20,389
Costs and expenses:
Depreciation and amortization	3,393	3,331
General and administrative	688	788
Intercompany leasing	1,215	1,215
Bad debt expense (recovery)	0	0
Total costs and expenses	19,899	25,723
Income (loss) from operations	2,265	5,052
Other (expense) income:
Equity in earnings of subsidiaries	0	0
Interest expense	4	7
Loss on extinguishment of debt	0
Other	(738)	(967)
Total other expense	(734)	(960)
Income (loss) before income taxes	1,531	4,092
Income tax (expense) benefit	956	1,750
Net income (loss)	575	2,342
Eliminations [Member]
Revenues	0	0
Operating Costs	0	0
Costs and expenses:
Depreciation and amortization	0	0
General and administrative	(138)	(138)
Intercompany leasing	0	0
Bad debt expense (recovery)	0	0
Total costs and expenses	(138)	(138)
Income (loss) from operations	138	138
Other (expense) income:
Equity in earnings of subsidiaries	(13,460)	(11,531)
Interest expense	0	0
Loss on extinguishment of debt	0
Other	(138)	(138)
Total other expense	(13,598)	(11,669)
Income (loss) before income taxes	(13,460)	(11,531)
Income tax (expense) benefit	0	0
Net income (loss)	$ (13,460)	$ (11,531)