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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 38,432,000     38,432,000 1,922,000
Comprehensive Income (Loss), Net of Tax, Attributable to Parent 40,354,000        
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt, Subsequent Adjustments (2,427,000)   (2,427,000)    
Equity Issuance Costs (56,000)   (56,000)    
Share-based compensation 1,425,000   1,425,000    
Dividends declared, $1.54 per share (41,532,000)     (41,532,000)  
Balance, value at Mar. 31, 2018 $ 1,319,881,000 $ 415,000 $ 1,288,861,000 $ 29,270,000 $ 1,335,000
Balance, shares at Mar. 31, 2018 41,532,154 41,532,154      
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