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Equity - Rollforward (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Equity activity        
Balance at beginning of period     $ 659,202  
Net income $ 22,180 $ 17,928 42,038 $ 35,480
Proceeds from common stock offering, net of offering costs     70,563  
Stock-based compensation expense     2,019  
Stock option exercise     159  
Reclassification adjustment (5) $ (8) (33) $ (17)
Common stock dividends     (41,031)  
Other     (2,174)  
Balance at end of period $ 730,743   $ 730,743