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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Preferred Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Treasury Stock [Member]
Noncontrolling Interest [Member]
Parent Company [Member]
Beginning balance at Dec. 31, 2017 $ 1,645,258 $ 1,233,845 $ (52,239) $ 0 $ 453 $ 199,560 $ (471) $ 264,110  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Total comprehensive income 460,319 305,704 154,615 0 0 0 0 0  
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification                 $ 0
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | Accounting Standards Update 2016-01 [Member]   2,900 (2,900)            
Stock-based compensation 4,612 0 0 0 0 4,612 0 0  
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures (1,025) (985) 0 0 0 0 (40) 0  
Stock Issued During Period, Value, New Issues 1 0 0 0 1 0 0 0  
Ending balance at Mar. 31, 2018 2,109,165 1,541,464 99,476 0 454 204,172 (511) 264,110  
Beginning balance at Dec. 31, 2017 1,645,258 1,233,845 (52,239) 0 453 199,560 (471) 264,110  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
AMPS Impact on Stockholders Equity 2,764                
Ending balance at Dec. 31, 2018 1,633,147 1,421,302 (48,715) 0 454 219,429 (473) 41,150  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Total comprehensive income 28,056 (43,201) 71,257 0 0 0 0 0  
Stock-based compensation 4,116 0 0 0 0 4,116 0 0  
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures (2,197) (1,857) 0 0 0 0 (340) 0  
Stock Issued During Period, Value, New Issues 2 0 0 0 2 0 0 0  
Ending balance at Mar. 31, 2019 $ 1,665,888 $ 1,376,244 $ 22,542 $ 0 $ 456 $ 223,545 $ (813) $ 43,914