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Consolidated Statement Of Equity - USD ($)
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Cumulative Dividends In Excess Of Net Income [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets       $ (235,000) $ 235,000
Balance, shares at Dec. 31, 2017 41,532,154 41,532,154      
Balance, value at Dec. 31, 2017 $ 1,322,117,000 $ 415,000 $ 1,289,919,000 32,605,000 (822,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income (loss) attributable to common stockholders 76,271,000     76,271,000 2,725,000
Comprehensive Income (Loss), Net of Tax, Attributable to Parent 78,996,000        
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt, Subsequent Adjustments (2,427,000)   (2,427,000)    
Stock Issued During Period, Shares, New Issues   628,403      
Stock Issued During Period, Value, New Issues 44,920,000 $ 7,000 44,913,000    
Adjustments Related to Tax Withholding for Share-based Compensation (325,000)   (325,000)    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period   11,309      
Share-based compensation 1,794,000   1,794,000    
Dividends declared, $1.54 per share (83,703,000)     (83,703,000)  
Balance, value at Jun. 30, 2018 $ 1,361,372,000 $ 422,000 $ 1,333,874,000 $ 24,938,000 $ 2,138,000
Balance, shares at Jun. 30, 2018 42,171,866 42,171,866      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets $ 235,000