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Net Income Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Net income                 $ 87,340 $ 85,115 $ 73,081
Less net income allocated to participating securities:                      
Nonforfeitable dividends on participating securities                 (350) (373) (480)
Income allocated to participating securities                 (12) (12) (4)
Total net income allocated to participating securities                 (362) (385) (484)
Less net income allocated to preferred stockholders:                      
Preferred stock dividends                     (2,454)
Total net income allocated to preferred stockholders                     (2,454)
Net income available to common stockholders $ 19,753 $ 20,536 $ 25,273 $ 21,416 $ 20,577 $ 22,321 $ 22,075 $ 19,757 86,978 84,730 70,143
Effect of dilutive securities:                      
Participating securities                 362 385  
Convertible preferred securities                     2,454
Dilutive Securities, Effect on Basic Earnings Per Share, Total                 362 385 2,454
Net income for diluted net income per share                 $ 87,340 $ 85,115 $ 72,597
Shares for basic net income per share                 39,409 38,388 35,590
Effect of dilutive securities: (Shares)                      
Convertible preferred securities (in shares)                     1,726
Total effect of dilutive securities (in shares)                 228 209 1,739
Shares for diluted net income per share                 39,637 38,597 37,329
Basic (in dollars per share) $ 0.50 $ 0.52 $ 0.64 $ 0.54 $ 0.53 $ 0.57 $ 0.58 $ 0.53 $ 2.21 $ 2.21 $ 1.97
Diluted (in dollars per share) $ 0.50 $ 0.52 $ 0.64 $ 0.54 $ 0.53 $ 0.57 $ 0.58 $ 0.53 $ 2.20 $ 2.21 $ 1.94
Stock options                      
Effect of dilutive securities: (Shares)                      
Stock options and performance-based stock units (in shares)                 10 13 13
Performance-based stock units                      
Effect of dilutive securities: (Shares)                      
Stock options and performance-based stock units (in shares)                 67 27  
Participating Securities                      
Effect of dilutive securities: (Shares)                      
Participating securities                 151 169