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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

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