Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 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	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 321,802	$ 308,524	$ 297,686	$ 293,908	$ 330,713	$ 356,595	$ 337,096	$ 309,166	$ 1,221,920	$ 1,333,570	$ 1,331,421
Gross profit	71,242	66,318	61,190	54,414	67,423	77,121	72,053	59,190	253,164	275,787	279,983
Operating income (loss)	26,315	20,505	8,145	(4,139)	(28,640)	24,938	14,523	9,125	50,826	19,946	(19,812)
Net income (loss)	$ 18,129	$ 11,787	$ 3,193	$ (3,949)	$ (33,433)	$ 15,223	$ 8,848	$ 1,372	$ 29,488	$ (8,067)	$ (37,167)
Basic:
Net income (in Dollars per share)	$ 0.52	$ 0.35	$ 0.10	$ (0.11)	$ (0.91)	$ 0.41	$ 0.24	$ 0.04	$ 0.85	$ (0.22)	$ (0.98)
Diluted earnings per share
Net income (loss) (in Dollars per share)	$ 0.52	$ 0.34	$ 0.10	$ (0.11)	$ (0.91)	$ 0.40	$ 0.24	$ 0.04	$ 0.84	$ (0.22)	$ (0.98)
Restructuring Cost and Reserve [Line Items]
Restructuring charges									$ 9,168	$ 968	$ 687
Gain on litigation settlement									6,625	0	0
Goodwill impairment					$ 43,500				0	43,484	51,512
Restructuring Plan 2016
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 1,300	$ 1,300	$ 3,800	$ 9,700					$ 16,100
Restructuring Plan 2014
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 300	$ (400)	$ 100	$ (200)	$ 300	$ 1,500	$ 5,700	$ 3,500		$ 8,100	$ 47,800