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Earnings Per Share - Calculation of EPS (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Numerator:                      
Income from continuing operations                 $ 85,630 $ 163,377 $ 23,828
Income from discontinued operations, net of income taxes                 0 0 25,237
Net income $ 25,703 $ 24,464 $ 24,822 $ 10,641 $ 63,616 $ 43,808 $ 51,916 $ 4,037 $ 85,630 $ 163,377 $ 49,065
Denominator:                      
Weighted-average number of common shares outstanding—basic                 200,796,678 195,943,813 195,478,353
Effect of dilutive securities:                      
Unvested restricted common stock                 129,640 181,310 177,314
Shares related to unvested PSUs and MSUs                 533,092 556,763 206,839
Unexercised stock appreciation rights                 524 1,095 0
Weighted-average number of common shares outstanding—diluted                 201,459,934 196,682,981 195,862,506
Basic earnings per share:                      
Continuing operations (in dollars per share)                 $ 0.43 $ 0.83 $ 0.12
Discontinued operations (in dollars per share)                 0.00 0.00 0.13
Total (in dollars per share) $ 0.14 $ 0.12 $ 0.12 $ 0.05 $ 0.32 $ 0.22 $ 0.27 $ 0.02 0.43 0.83 0.25
Diluted earnings earnings per share:                      
Continuing operations (in dollars per share)                 0.43 0.83 0.12
Discontinued operations (in dollars per share)                 0.00 0.00 0.13
Total (in dollars per share) $ 0.14 $ 0.12 $ 0.12 $ 0.05 $ 0.32 $ 0.22 $ 0.26 $ 0.02 $ 0.43 $ 0.83 $ 0.25
Stock Appreciation Rights (SARs)                      
Earnings Per Share [Line Items]                      
Antidilutive securities excluded from computation of earnings per share, amount                     262,461