Debt - Consolidated Net Leverage Ratio (Details) - Credit Agreement		12 Months Ended
	Jul. 05, 2017	Dec. 31, 2017
Covenant Term 1
Line of Credit Facility [Line Items]
Commitment fee percentage		0.25%
Covenant Term 1 | Eurodollar Loans
Line of Credit Facility [Line Items]
Interest margin		1.75%
Covenant Term 1 | LIBOR Index Rate Loans
Line of Credit Facility [Line Items]
Interest margin		1.75%
Covenant Term 1 | Letter of Credit Fee
Line of Credit Facility [Line Items]
Interest margin		1.75%
Covenant Term 1 | Base Rate Loans
Line of Credit Facility [Line Items]
Interest margin		0.75%
Covenant Term 1 | Maximum
Line of Credit Facility [Line Items]
Consolidated Net Leverage Ratio		1.50
Covenant Term 2
Line of Credit Facility [Line Items]
Commitment fee percentage		0.30%
Covenant Term 2 | Eurodollar Loans
Line of Credit Facility [Line Items]
Interest margin		2.00%
Covenant Term 2 | LIBOR Index Rate Loans
Line of Credit Facility [Line Items]
Interest margin		2.00%
Covenant Term 2 | Letter of Credit Fee
Line of Credit Facility [Line Items]
Interest margin		2.00%
Covenant Term 2 | Base Rate Loans
Line of Credit Facility [Line Items]
Interest margin		1.00%
Covenant Term 2 | Minimum
Line of Credit Facility [Line Items]
Consolidated Net Leverage Ratio		1.50
Covenant Term 2 | Maximum
Line of Credit Facility [Line Items]
Consolidated Net Leverage Ratio		2.00
Covenant Term 3
Line of Credit Facility [Line Items]
Commitment fee percentage	0.30%	0.30%
Covenant Term 3 | Eurodollar Loans
Line of Credit Facility [Line Items]
Interest margin	2.25%	2.25%
Covenant Term 3 | LIBOR Index Rate Loans
Line of Credit Facility [Line Items]
Interest margin		2.25%
Covenant Term 3 | Letter of Credit Fee
Line of Credit Facility [Line Items]
Interest margin		2.25%
Covenant Term 3 | Base Rate Loans
Line of Credit Facility [Line Items]
Interest margin	1.25%	1.25%
Covenant Term 3 | Minimum
Line of Credit Facility [Line Items]
Consolidated Net Leverage Ratio		2.00
Covenant Term 3 | Maximum
Line of Credit Facility [Line Items]
Consolidated Net Leverage Ratio		2.50
Covenant Term 4
Line of Credit Facility [Line Items]
Commitment fee percentage		0.35%
Covenant Term 4 | Eurodollar Loans
Line of Credit Facility [Line Items]
Interest margin		2.50%
Covenant Term 4 | LIBOR Index Rate Loans
Line of Credit Facility [Line Items]
Interest margin		2.50%
Covenant Term 4 | Letter of Credit Fee
Line of Credit Facility [Line Items]
Interest margin		2.50%
Covenant Term 4 | Base Rate Loans
Line of Credit Facility [Line Items]
Interest margin		1.50%
Covenant Term 4 | Minimum
Line of Credit Facility [Line Items]
Consolidated Net Leverage Ratio		2.50
Covenant Term 4 | Maximum
Line of Credit Facility [Line Items]
Consolidated Net Leverage Ratio		3.00
Covenant Term 5
Line of Credit Facility [Line Items]
Commitment fee percentage		0.40%
Covenant Term 5 | Eurodollar Loans
Line of Credit Facility [Line Items]
Interest margin		2.75%
Covenant Term 5 | LIBOR Index Rate Loans
Line of Credit Facility [Line Items]
Interest margin		2.75%
Covenant Term 5 | Letter of Credit Fee
Line of Credit Facility [Line Items]
Interest margin		2.75%
Covenant Term 5 | Base Rate Loans
Line of Credit Facility [Line Items]
Interest margin		1.75%
Covenant Term 5 | Minimum
Line of Credit Facility [Line Items]
Consolidated Net Leverage Ratio		3.00