Earnings per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Numerator [Abstract]
Net income from continuing operations									$ 61,951	$ 46,841	$ 3,106
Net (loss) income from discontinued operations									1,318	(8,194)	(21,897)
Net income (loss)	$ 30,132	$ 25,399	$ 3,034	$ 4,704	$ 26,996	$ 3,190	$ 7,866	$ 595	$ 63,269	$ 38,647	$ (18,791)
Denominator [Abstract]
Denominator for basic earnings per share – weighted-average common shares outstanding (shares)									98,835,000	92,451,000	91,914,000
Effect of dilutive securities [Abstract]
Stock options, restricted shares and warrants (in shares)									2,633,000	1,087,000	0
Dilutive potential common shares [Abstract]
Denominator for diluted earnings per share - adjusted weighted-average shares and assumed exercise of options, restricted shares and warrants (in shares)									101,468,000	93,538,000	91,914,000
Earnings Per Share, Basic [Abstract]
Continuing operations (in dollars per share)									$ 0.63	$ 0.51	$ 0.04
Discontinued operations (in dollars per share)									$ 0.01	$ (0.09)	$ (0.24)
Total (in dollars per share)	$ 0.29	$ 0.24	$ 0.03	$ 0.05	$ 0.29	$ 0.03	$ 0.09	$ 0.01	$ 0.64	$ 0.42	$ (0.20)
Earnings Per Share, Diluted [Abstract]
Continuing operations (in dollars per share)									$ 0.61	$ 0.50	$ 0.04
Discontinued operations (in dollars per share)									$ 0.01	$ (0.09)	$ (0.24)
Total (in dollars per share)	$ 0.28	$ 0.24	$ 0.03	$ 0.05	$ 0.29	$ 0.03	$ 0.08	$ 0.01	$ 0.62	$ 0.41	$ (0.20)
Stock options excluded from the calculation of diluted income (loss) per share (in shares)									0	0	1,349