Earnings (Loss) Per Share, Calculation of EPS (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Numerator:
Income from continuing operations	$ 43,808	$ 7,679	$ 99,762	$ 16,999
Income from discontinued operations	0	885	0	2,510
Net income	$ 43,808	$ 8,564	$ 99,762	$ 19,509
Denominator:
Weighted-average number of common shares outstanding—basic	195,796,772	195,546,384	195,733,185	195,455,225
Weighted-average number of common shares outstanding—diluted	196,434,773	195,860,361	196,341,317	195,747,023
Basic earnings per share:
Continuing operations (in dollars per share)	$ 0.22	$ 0.04	$ 0.51	$ 0.09
Discontinued operations (in dollars per share)	$ 0.00	$ 0.00	$ 0.00	$ 0.01
Basic earnings per share (in dollars per share)	$ 0.22	$ 0.04	$ 0.51	$ 0.10
Diluted earnings per share:
Continuing operations (in dollars per share)	$ 0.22	$ 0.04	$ 0.51	$ 0.09
Discontinued operations (in dollars per share)	$ 0.00	$ 0.00	$ 0.00	$ 0.01
Total (in dollars per share)	$ 0.22	$ 0.04	$ 0.51	$ 0.10
Unvested restricted common stock [Member]
Denominator:
Unvested Stock/SARs/MSUs	215,834	151,878	193,477	119,848
Stock Appreciation Rights [Member]
Denominator:
Unvested Stock/SARs/MSUs	7,512	0	0	0
Shares related to unvested MSUs and PSUs [Member]
Denominator:
Unvested Stock/SARs/MSUs	414,655	162,099	414,655	171,950