Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
A reconciliation between basic and diluted earnings per share computations
Income (loss) available to common stockholders	$ (122,240)	$ 10,043
Net loss available to common stockholders (in shares)	64,774	63,846
Attributable to participating securities		(289)
Net income or loss available to common stockholders, Loss (excluding income attributable to participating securities)	(122,240)	9,754
Net loss available to common stockholders, Per Share Amount	$ (1.89)	$ 0.15
Stock options, effect of dilutive securities, (in shares)		56
Attributable to participating securities		(289)
Restricted stock, effect of dilutive securities (in shares)	0	0
DILUTED EPS, Loss	$ (122,240)	$ 9,754
DILUTED EPS, Shares	64,774	63,902
DILUTED EPS, Per Share Amount	$ (1.89)	$ 0.15