Debt (Terms of Revolver) (Details) - USD ($)	Jun. 30, 2018	Mar. 21, 2018
Revolving Credit Facility [Member] | Credit Facility [Member]
Line of Credit Facility [Line Items]
Delay draw term loan		$ 10,000,000
Revolving Credit Facility [Member] | Credit Facility [Member] | Domestic Line of Credit [Member]
Line of Credit Facility [Line Items]
Delay draw term loan		9,000,000
Revolving Credit Facility [Member] | Credit Facility [Member] | Foreign Line of Credit [Member]
Line of Credit Facility [Line Items]
Delay draw term loan		1,000,000
Line of Credit [Member]
Line of Credit Facility [Line Items]
Delay draw term loan	$ 203,687,500
Line of Credit [Member] | Credit Facility [Member]
Line of Credit Facility [Line Items]
Delay draw term loan		$ 258,700,000
Letter of Credit [Member] | Credit Facility [Member] | Domestic Line of Credit [Member]
Line of Credit Facility [Line Items]
Delay draw term loan	500,000.0
Letter of Credit [Member] | Credit Facility [Member] | Foreign Line of Credit [Member]
Line of Credit Facility [Line Items]
Delay draw term loan	$ 250,000.00