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Long-Term Debt - Credit Facility (Details) - USD ($) $ in Thousands		3 Months Ended								4 Months Ended	12 Months Ended
	Apr. 26, 2018	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Apr. 26, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Line of Credit Facility
Repayments of long-term debt											$ 605,636	$ 1,270,194	$ 675,000
Debt extinguishment loss		$ 0	$ 0	$ 2,450	$ 0	$ 0	$ 0	$ 0	$ 291		2,450	$ 291	$ 0
Revolving Credit Facility \| Revolving Credit Facility Due November 2020
Line of Credit Facility
Interest rate (as a percent)						3.30%						3.30%
Commitment fee amount										$ 200		$ 700
Debt issuance costs											$ 700
Revolving Credit Facility \| Revolving Credit Facility Due November 2020 \| Parent Company
Line of Credit Facility
Repayments of long-term debt	$ 63,200
Line of credit outstanding	15,400									$ 15,400
Debt extinguishment loss	$ 2,500