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Earnings Per Share - Basic and Diluted Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Basic Earnings per Common Share        
Net income attributable to Company $ 27,845 $ 23,268 $ 61,364 $ 54,654
Less: Preferred stock dividends (3,225) (3,225) (9,675) (9,675)
NET INCOME ATTRIBUTABLE TO COMPANY'S COMMON STOCKHOLDERS $ 24,620 $ 20,043 $ 51,689 $ 44,979
Weighted average common shares outstanding-basic (in shares) 111,886 109,569 111,824 109,487
Basic Earnings per Common Share (in dollars per share) $ 0.22 $ 0.18 $ 0.46 $ 0.41
Diluted Earnings per Common Share:        
Net income attributable to Company $ 27,845 $ 23,268 $ 61,364 $ 54,654
Less: Preferred stock dividends (3,225) (3,225) (9,675) (9,675)
Add back: Interest expense on convertible notes for the period, net of tax 2,428 0 6,982 0
Net income attributable to Company's common stockholders $ 27,048 $ 20,043 $ 58,671 $ 44,979
Weighted average common shares outstanding-basic (in shares) 111,886 109,569 111,824 109,487
Net effect of assumed convertible notes conversion to common shares (in shares) 19,694 0 18,107 0
Diluted weighted average common shares outstanding (in shares) 131,580 109,569 129,931 109,487
Diluted Earnings per Common Share (in dollars per share) $ 0.21 $ 0.18 $ 0.45 $ 0.41