Long-Term Debt - Payment Dates and Percentages (Details) - Term Loan - Term A Loan	12 Months Ended
	Dec. 31, 2018
Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Quarterly installments of principal payments, percent of initial aggregate principal amount	0.63%
Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Quarterly installments of principal payments, percent of initial aggregate principal amount	1.25%
Debt Instrument, Redemption, Period Three
Debt Instrument [Line Items]
Quarterly installments of principal payments, percent of initial aggregate principal amount	2.50%