CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Thousands	3 Months Ended								6 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2016	Jun. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE (LOSS) INCOME
Net revenue	$ 281,053	$ 260,084	$ 264,456	$ 236,461	$ 285,653	$ 275,182	$ 272,836	$ 233,501	$ 500,917	$ 506,337	$ 761,001	$ 781,519	$ 1,042,054	$ 1,067,172	$ 1,012,100
Material costs	86,963	85,437	82,971	76,700	88,062	85,492	85,901	76,828	159,671	162,729	245,108	248,221	332,071	336,283	324,284
Personnel costs	96,880	89,113	88,406	89,138	95,570	95,220	89,912	86,392	177,544	176,304	266,657	271,524	363,537	367,094	353,586
Other operating costs	36,154	34,139	31,970	36,761	34,039	32,764	37,604	36,431	68,731	74,035	102,870	106,799	139,024	140,839	136,885
General and administrative expenses	23,770	25,726	30,170	27,558	27,103	29,689	29,112	25,857	57,728	54,969	83,454	84,658	107,224	111,761	86,115
Professional accounting and legal fees	9,829	9,023	10,692	11,689	9,646	9,348	4,853	4,800	22,381	9,653	31,404	19,001	41,233	28,647	44,798
Depreciation and amortization	10,160	11,339	11,660	11,728	15,957	10,240	9,916	10,230	23,388	20,146	34,727	30,386	44,887	46,343	38,929
Impairment of intangible assets	86,164				384,996	812						812	86,164	385,807	223
(Loss) income from operations	(68,867)	5,307	8,587	(17,113)	(369,720)	11,617	15,538	(7,037)	(8,526)	8,501	(3,219)	20,118	(72,086)	(349,602)	27,280
Interest expense, net	13,734	12,809	9,818	8,838	7,935	7,404	7,380	7,173	18,656	14,553	31,465	21,957	45,199	29,892	28,277
Loss on extinguishment of debt		6,041	(10)		7,237				(10)		6,031		6,031	7,237
Loss from continuing operations before income taxes	(82,601)	(13,543)	(1,221)	(25,951)	(384,892)	4,213	8,158	(14,210)	(27,172)	(6,052)	(40,715)	(1,839)	(123,316)	(386,731)	(997)
(Benefit) provision for income taxes	(1,488)	(5,687)	(321)	(8,414)	(69,768)	1,133	228	793	(8,735)	1,021	(14,422)	2,154	(15,910)	(67,614)	2,023
Loss from continuing operations	(81,113)	(7,856)	(900)	(17,537)	(315,124)	3,080	7,930	(15,003)	(18,437)	(7,073)	(26,293)	(3,993)	(107,406)	(319,117)	(3,020)
Income (loss) from discontinued operations, net of income taxes	(15)	378	572		(664)		(6,343)	(967)	572	(7,310)	950	(7,310)	935	(7,974)	(15,946)
Net loss	(81,128)	(7,478)	(328)	(17,537)	(315,788)	3,080	1,587	(15,970)	(17,865)	(14,383)	(25,343)	(11,303)	(106,471)	(327,091)	(18,966)
Other comprehensive (loss) income:
Unrealized (loss) gain on SERP, net of income tax (benefit) provision of $(16), $81 and $(525) for 2016, 2015 and 2014, respectively	(84)	19	19	19	393	27	27	27	38	54	57	81	(26)	474	(868)
Comprehensive loss	$ (81,212)	$ (7,459)	$ (309)	$ (17,518)	$ (315,395)	$ 3,107	$ 1,614	$ (15,943)	$ (17,827)	$ (14,329)	$ (25,286)	$ (11,222)	$ (106,497)	$ (326,617)	$ (19,834)
Basic and Diluted Per Common Share Data:
Loss from continuing operations	$ (2.25)	$ (0.22)	$ (0.03)	$ (0.49)					$ (0.51)		$ (0.73)		$ (2.99)	$ (8.96)	$ (0.09)
Income (loss) from discontinued operations, net of income taxes		0.01	0.02						0.01		0.02		0.03	(0.22)	(0.45)
Basic and diluted loss per share	$ (2.25)	$ (0.21)	$ (0.01)	$ (0.49)					$ (0.50)		$ (0.71)		$ (2.96)	$ (9.18)	$ (0.54)
Shares used to compute basic and diluted per common share amounts	36,032	36,008	35,949	35,742					35,846		35,900		35,933,222	35,635,448	35,309,478