Guarantor and Non-guarantor Financial Statements, Condensed Consolidated Statements of Cash Flows (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ (2,307)	$ (38,313)	$ (178,007)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and impairment	33,735	35,579	181,866
Amortization - deferred financing costs and debt discount	2,479	2,684	2,759
Amortization - other intangible assets	8,138	8,750	10,981
(Gain) loss on disposal of assets	392	12,087	875
Deferred income taxes	(2,311)	(13,035)	(3,803)
Non-cash stock-based compensation	2,456	2,411	3,119
Equity in earnings of subsidiaries	0	0	0
Change in other operating items	(10,067)	(12,089)	10,938
Net cash provided by (used in) operating activities	32,515	(1,926)	28,728
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(25,645)	(38,855)	(59,194)
Proceeds from notes receivable	0	0
Payments on notes receivable	0	0
Other	634	46,944	1,000
Net cash provided by (used in) investing activities	(25,011)	8,089	(58,194)
CASH FLOWS FROM FINANCING ACTIVITIES:
Payments of notes payable	(18,000)	(20,000)	0
Proceeds from notes payable	10,000	25,000	0
Other	(3,157)	(4,488)	(698)
Increase in revolving credit advance			0
Net cash provided by financing activities	(11,157)	512	(698)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(3,653)	6,675	(30,164)
CASH AND CASH EQUIVALENTS-Beginning of period	33,426	26,751	56,915
CASH AND CASH EQUIVALENTS-End of period	29,773	33,426	26,751
Eliminations [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	(25,326)	(12,515)	147,264
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and impairment	0	0	0
Amortization - deferred financing costs and debt discount	0	0	0
Amortization - other intangible assets	0	0	0
(Gain) loss on disposal of assets	0	0	0
Deferred income taxes	0	0	0
Non-cash stock-based compensation	0	0	0
Equity in earnings of subsidiaries	24,923	12,205	(147,264)
Change in other operating items	403	310	0
Net cash provided by (used in) operating activities	0	0	0
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	0	0	0
Proceeds from notes receivable	239,955	298,178
Payments on notes receivable	(181,782)	(254,566)
Other	0	0	0
Net cash provided by (used in) investing activities	58,173	43,612	0
CASH FLOWS FROM FINANCING ACTIVITIES:
Payments of notes payable	181,782	254,566
Proceeds from notes payable	(239,955)	(298,178)
Other	0	0	0
Increase in revolving credit advance			0
Net cash provided by financing activities	(58,173)	(43,612)	0
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	0	0	0
CASH AND CASH EQUIVALENTS-Beginning of period	0	0	0
CASH AND CASH EQUIVALENTS-End of period	0	0	0
Parent [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	(2,307)	(38,313)	(178,007)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and impairment	11,261	10,503	10,493
Amortization - deferred financing costs and debt discount	2,479	2,684	2,759
Amortization - other intangible assets	7,970	8,583	8,616
(Gain) loss on disposal of assets	593	761	(1,950)
Deferred income taxes	(3,097)	(3,910)	(1,571)
Non-cash stock-based compensation	2,456	2,411	3,119
Equity in earnings of subsidiaries	(24,923)	(12,205)	147,264
Change in other operating items	57,454	77,131	35,877
Net cash provided by (used in) operating activities	51,886	47,645	26,600
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(10,151)	(15,283)	(25,152)
Proceeds from notes receivable	(628)	(73,047)
Payments on notes receivable	(19,031)	29,207
Other	(671)	14,944	(37,823)
Net cash provided by (used in) investing activities	(30,481)	(44,179)	(62,975)
CASH FLOWS FROM FINANCING ACTIVITIES:
Payments of notes payable	(147,455)	(245,359)
Proceeds from notes payable	117,742	250,131
Other	0	(1,333)	0
Increase in revolving credit advance			8,910
Net cash provided by financing activities	(29,713)	3,439	8,910
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(8,308)	6,905	(27,465)
CASH AND CASH EQUIVALENTS-Beginning of period	31,018	24,113	51,578
CASH AND CASH EQUIVALENTS-End of period	22,710	31,018	24,113
Guarantor Subsidiaries [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	17,529	16,378	(146,083)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and impairment	18,301	19,584	159,067
Amortization - deferred financing costs and debt discount	0	0	0
Amortization - other intangible assets	168	167	2,365
(Gain) loss on disposal of assets	(228)	176	2,718
Deferred income taxes	925	(8,438)	0
Non-cash stock-based compensation	0	0	0
Equity in earnings of subsidiaries	0	0	0
Change in other operating items	(62,615)	(50,391)	(19,495)
Net cash provided by (used in) operating activities	(25,920)	(22,524)	(1,428)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(14,813)	(19,573)	(24,200)
Proceeds from notes receivable	(200,078)	(185,927)
Payments on notes receivable	162,777	187,368
Other	1,305	0	28,844
Net cash provided by (used in) investing activities	(50,809)	(18,132)	4,644
CASH FLOWS FROM FINANCING ACTIVITIES:
Payments of notes payable	(52,327)	(29,207)
Proceeds from notes payable	132,213	73,047
Other	(3,157)	(3,155)	(698)
Increase in revolving credit advance			0
Net cash provided by financing activities	76,729	40,685	(698)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	0	29	2,518
CASH AND CASH EQUIVALENTS-Beginning of period	0	(29)	(2,547)
CASH AND CASH EQUIVALENTS-End of period	0	0	(29)
Non-guarantor Subsidiaries [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	7,797	(3,863)	(1,181)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and impairment	4,173	5,492	12,306
Amortization - deferred financing costs and debt discount	0	0	0
Amortization - other intangible assets	0	0	0
(Gain) loss on disposal of assets	27	11,150	107
Deferred income taxes	(139)	(687)	(2,232)
Non-cash stock-based compensation	0	0	0
Equity in earnings of subsidiaries	0	0	0
Change in other operating items	(5,309)	(39,139)	(5,444)
Net cash provided by (used in) operating activities	6,549	(27,047)	3,556
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(681)	(3,999)	(9,842)
Proceeds from notes receivable	(39,249)	(39,204)
Payments on notes receivable	38,036	37,991
Other	0	32,000	9,979
Net cash provided by (used in) investing activities	(1,894)	26,788	137
CASH FLOWS FROM FINANCING ACTIVITIES:
Payments of notes payable	0	0
Proceeds from notes payable	0	0
Other	0	0	0
Increase in revolving credit advance			(8,910)
Net cash provided by financing activities	0	0	(8,910)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	4,655	(259)	(5,217)
CASH AND CASH EQUIVALENTS-Beginning of period	2,408	2,667	7,884
CASH AND CASH EQUIVALENTS-End of period	$ 7,063	$ 2,408	$ 2,667