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Debt (Schedule of Gain on Debt Extinguishment) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]      
Principal amount repurchased     $ 116,600,000
Repurchase price     103,700,000
Less: accrued interest paid     (2,300,000)
Net repurchase price     101,400,000
Debt financing fees expensed     (100,000)
Debt issuance costs expensed     (1,000,000)
Loss (gain) on debt extinguishment $ 0 $ (2,600,000) 14,100,000
Master note and security agreement      
Debt Instrument [Line Items]      
Principal amount repurchased     60,100,000.0
Repurchase price     61,200,000
Less: accrued interest paid     (1,200,000)
Net repurchase price     60,000,000
Debt financing fees expensed     (100,000)
Debt issuance costs expensed     (200,000)
Loss (gain) on debt extinguishment     (200,000)
Senior Unsecured Notes      
Debt Instrument [Line Items]      
Principal amount repurchased     56,500,000.0
Repurchase price     42,500,000
Less: accrued interest paid     (1,100,000)
Net repurchase price     41,400,000
Debt financing fees expensed     0
Debt issuance costs expensed     (800,000)
Loss (gain) on debt extinguishment     $ 14,300,000