Financing Arrangements - JPM Revolving Facility, Interest Terms (Details)	12 Months Ended
	Dec. 31, 2018
Category 1 | Base Rate | Minimum
Guarantor Obligations [Line Items]
Fixed Charge Coverage Ratio	1.5
Category 1 | Eurodollar | Minimum
Guarantor Obligations [Line Items]
Fixed Charge Coverage Ratio	1.5
Category 1 | JPM Revolving Facility | Revolving Credit Facility | Base Rate
Guarantor Obligations [Line Items]
Basis spread on variable rate	0.50%
Category 1 | JPM Revolving Facility | Revolving Credit Facility | Eurodollar
Guarantor Obligations [Line Items]
Basis spread on variable rate	1.50%
Category 2 | Base Rate | Minimum
Guarantor Obligations [Line Items]
Fixed Charge Coverage Ratio	1.25
Category 2 | Base Rate | Maximum
Guarantor Obligations [Line Items]
Fixed Charge Coverage Ratio	1.5
Category 2 | Eurodollar | Minimum
Guarantor Obligations [Line Items]
Fixed Charge Coverage Ratio	1.25
Category 2 | Eurodollar | Maximum
Guarantor Obligations [Line Items]
Fixed Charge Coverage Ratio	1.5
Category 2 | JPM Revolving Facility | Revolving Credit Facility | Base Rate
Guarantor Obligations [Line Items]
Basis spread on variable rate	0.75%
Category 2 | JPM Revolving Facility | Revolving Credit Facility | Eurodollar
Guarantor Obligations [Line Items]
Basis spread on variable rate	1.75%
Category 3 | Base Rate | Maximum
Guarantor Obligations [Line Items]
Fixed Charge Coverage Ratio	1.25
Category 3 | Eurodollar | Maximum
Guarantor Obligations [Line Items]
Fixed Charge Coverage Ratio	1.25
Category 3 | JPM Revolving Facility | Revolving Credit Facility | Base Rate
Guarantor Obligations [Line Items]
Basis spread on variable rate	1.00%
Category 3 | JPM Revolving Facility | Revolving Credit Facility | Eurodollar
Guarantor Obligations [Line Items]
Basis spread on variable rate	2.00%