Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	2 Months Ended		3 Months Ended								4 Months Ended		12 Months Ended
	Dec. 31, 2012		Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Jun. 30, 2012		Mar. 31, 2012		Oct. 31, 2012		Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
A reconciliation between basic and diluted earnings per share computations
Net income (loss) available to common stockholders	$ (25,451)	[1]	$ 2,291	$ 383	$ 3,662	$ 2,607	$ (54,520)	[1]	$ (18,608)	[1]	$ (38,639)	[1]	$ 8,943	$ (137,218)	$ 5,409
Net loss available to common stockholders (in shares)													63,054	62,459	61,937
Atributable to participating securities													(257)		(154)
Net income or loss available to common stockholders, Loss (excluding income attributable to participating securities)													8,686		5,255
Stock options, Effect of dilutive securities
Net loss available to common stockholders, Per Share Amount	$ (0.41)		$ 0.04	$ 0.01	$ 0.06	$ 0.04	$ (0.87)		$ (0.30)		$ (0.62)		$ 0.14	$ (2.20)	$ 0.08
Stock options, effect of dilutive securities, (in shares)													154		388
Dilutive Securities, Effect on Basic Earnings Per Share, Restricted Stock													(256)		(153)
Restricted stock, effect of dilutive securities (in shares)													0	0	0
DILUTED EPS, Loss													$ 8,687	$ (137,218)	$ 5,256
DILUTED EPS, Shares													63,208	62,459	62,325
DILUTED EPS, Per Share Amount (in dollars per share)	$ (0.41)		$ 0.04	$ 0.01	$ 0.06	$ 0.04	$ (0.87)		$ (0.30)		$ (0.62)		$ 0.14	$ (2.20)	$ 0.08

[1] Loss from operations and net loss available to common stockholders reported during the three months ended March 31, June 30, September 30 and December 31, 2012 included ceiling test write-downs of $20.1 million, $53.5 million, $35.4 million and $28.1 million, respectively.