Consolidated Statements of Stockholders' Equity (Deficit) (USD $) In Thousands, except Share data	Total	Common Stock	Additional paid-in capital	Retained earnings (deficit)	Accumulated other comprehensive (loss) income
Beginning Balance at Dec. 31, 2011	$ (106,143)	$ 262	$ 502,034	$ (414,945)	$ (193,494)
Beginning Balance, Shares at Dec. 31, 2011		26,197,000
Issuance of Common Stock, Shares		100,000
Forfeiture of restricted stock, Shares		(22,000)
Exercise of stock options, Shares		14,000
Stock based compensation expense, Shares		0
Employee benefit amounts reclassified from accumulated other comprehensive loss, Shares		0
Net loss	(153,294)	0	0	(153,294)	0
Issuance of Common Stock	0	0	0	0	0
Forfeiture of restricted stock	0	0	0	0	0
Exercise of stock options	64		64
Stock based compensation expense	4,055	0	4,055	0	0
Interest rate swaps other comprehensive loss	0
Employee benefit amounts reclassified from accumulated other comprehensive loss	(62,495)	0	0	0	(62,495)
Ending Balance at Dec. 31, 2012	(317,813)	262	506,153	(568,239)	(255,989)
Ending Balance, Shares at Dec. 31, 2012		26,289,000
Issuance of Common Stock, Shares		185,000
Forfeiture of restricted stock, Shares		(7,000)
Exercise of stock options, Shares		14,000
Stock based compensation expense, Shares		0
Employee benefit other comprehensive income before reclassifications, Shares		0
Employee benefit amounts reclassified from accumulated other comprehensive loss, Shares		0
Net loss	(93,450)	0	0	(93,450)	0
Issuance of Common Stock	0	2	(2)	0	0
Forfeiture of restricted stock	0	0	0	0	0
Exercise of stock options	50	0	50	0	0
Stock based compensation expense	5,807	0	5,807	0	0
Interest rate swaps other comprehensive loss	(601)	0	0	0	(601)
Employee benefit other comprehensive income before reclassifications	86,841	0	0	0	86,841
Employee benefit amounts reclassified from accumulated other comprehensive loss	9,970	0	0	0	9,970
Ending Balance at Dec. 31, 2013	(309,196)	264	512,008	(661,689)	(159,779)
Ending Balance, Shares at Dec. 31, 2013	26,480,837	26,481,000
Issuance of Common Stock, Shares		217,000
Forfeiture of restricted stock, Shares		(12,000)
Exercise of stock options, Shares		25,000
Stock based compensation expense, Shares		0
Employee benefit other comprehensive income before reclassifications, Shares		0
Employee benefit amounts reclassified from accumulated other comprehensive loss, Shares		0
Net loss	(136,319)	0	0	(136,319)	0
Issuance of Common Stock	0	3	(3)	0	0
Forfeiture of restricted stock	0	0	0	0	0
Exercise of stock options	(199)	0	(199)	0	0
Stock based compensation expense	4,274	0	4,274	0	0
Interest rate swaps other comprehensive loss	(1,037)	0	0	0	(1,037)
Employee benefit other comprehensive income before reclassifications	(166,673)	0	0	0	(166,673)
Employee benefit amounts reclassified from accumulated other comprehensive loss	(8,866)	0	0	0	(8,866)
Ending Balance at Dec. 31, 2014	$ (600,284)	$ 267	$ 516,080	$ (798,008)	$ (318,623)
Ending Balance, Shares at Dec. 31, 2014	26,710,569	26,711,000