Debt - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Finance lease obligation	$ 2,389	$ 3,231
Total	872,389	563,231
Term Loan Credit Facility Unamortized Debt Issuance Costs	(872)	(979)
Total Debt	871,517	562,252
Finance Lease Obligation Due Within One Year	(1,470)	(3,231)
Long-Term Debt	870,047	559,021
Revolving Credit Facility, due March 9, 2023
Debt Instrument [Line Items]
Long-term debt	$ 370,000	$ 60,000
Interest Rate	3.77%	3.67%
Term Loan Credit Facility, due July 31, 2021
Debt Instrument [Line Items]
Long-term debt	$ 500,000	$ 500,000
Interest Rate	3.51%	3.42%