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Earnings (Loss) Per Share (EPS) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Earnings Per Share [Abstract]                      
Net income (loss) $ 61,562 $ 6,175 $ 2,011 $ (3,907) $ (4,821) $ (4,799) $ (10,353) $ (7,820) $ 65,841 $ (27,793) $ (48,906)
Basic earnings (loss) per share (in dollars per share) $ 1.04 $ 0.10 $ 0.03 $ (0.07)         $ 1.11 $ (0.47) $ (0.84)
Basic weighted average shares outstanding (in shares) 59,140,011 59,130,401 59,105,613 58,936,694         59,070,948 58,683,194 58,281,425
Dilutive effect of non-vested shares (in shares)                 1,758,424 0 0
Dilutive weighted average shares outstanding (in shares) 61,229,338 60,284,746 59,830,899 58,936,694         60,829,372 58,683,194 58,281,425
Diluted earnings (loss) per share (in dollars per share) $ 1.01 $ 0.10 $ 0.03 $ (0.07)         $ 1.08 $ (0.47) $ (0.84)