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Debt (Debt Covenant Compliance) (Details)
12 Months Ended
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]  
Covenant compliance, leverage ratio 2.19
Covenant compliance senior secured leverage ratio 1.63
Interest coverage 6.23
Maximum  
Debt Instrument [Line Items]  
Covenant compliance, leverage ratio 3.75
Covenant compliance senior secured leverage ratio 3.50
Minimum  
Debt Instrument [Line Items]  
Covenant compliance, interest coverage 3.50
Financing Agreement, April 2014  
Debt Instrument [Line Items]  
Covenant compliance maximum annual dividend payment $ 120,000,000
Financing Agreement, April 2014 | Maximum  
Debt Instrument [Line Items]  
Covenant compliance total leverage ratio 3.00
Senior secured leverage ratio, payment restrictions on unsecured debt 3.00
Covenant compliance unsecured total leverage ratio 3.50