Consolidated Statements of Member's Interests - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 495,727	$ 540,697	$ 609,346
Investor interests issued under stock plans, net of shares withheld for employee taxes			(138)
Stock-based compensation	7,720	8,009	8,340
Proceeds from member’s capital contributions	0	26	2,557
Income tax benefit from stock awards	2,454	3,333	292
Return-of-capital distributions	(254,401)	(37,610)
Net loss	29,418	(18,728)	(79,700)
Ending balance	280,918	495,727	540,697
Member Interests [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	666,830	693,072	682,021
Investor interests issued under stock plans, net of shares withheld for employee taxes			(138)
Stock-based compensation	7,720	8,009	8,340
Proceeds from member’s capital contributions		26	2,557
Income tax benefit from stock awards	2,454	3,333	292
Return-of-capital distributions	(254,401)	(37,610)
Ending balance	422,603	666,830	693,072
Accumulated Deficit [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(171,103)	(152,375)	(72,675)
Net loss	29,418	(18,728)	(79,700)
Ending balance	$ (141,685)	$ (171,103)	$ (152,375)