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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Earnings Per Share [Abstract]        
Net income $ 36,624 $ 22,638 $ 73,957 $ 52,684
Basic weighted average number of shares outstanding (shares) 196,270,119 195,747,954 196,243,714 195,746,817
Dilutive effect of stock options (shares) 2,171,196 1,961,128 2,080,292 2,000,830
Diluted weighted average number of shares outstanding (shares) 198,441,315 197,709,082 198,324,006 197,747,647
Basic net income per common share (in usd per share) $ 0.19 $ 0.12 $ 0.38 $ 0.27
Diluted net income per common share (in usd per share) $ 0.18 $ 0.11 $ 0.37 $ 0.27
Anti-dilutive shares excluded from diluted earnings per share computation (shares) 375,688 67,938 288,284 0