Long-term Debt - Schedule of Long-term Debt (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Debt Instrument [Line Items]
Total long-term debt	$ 376,700,000		$ 382,100,000
Amortization of debt issuance costs	200,000	$ 200,000
Revolving credit facility
Debt Instrument [Line Items]
Unamortized debt issuance costs	1,500,000		1,700,000
Revolving credit facility, expansion feature	200,000,000
Average borrowings	336,400,000	277,600,000
Unused Credit Facility and letter of credit participation fees	300,000	300,000
Amortization of debt issuance costs	$ 200,000	$ 200,000
Weighted-average interest rate	2.70%	3.70%
Revolving credit facility
Debt Instrument [Line Items]
Total long-term debt	$ 313,000,000.0		324,800,000
Outstanding letters of credit	19,700,000		16,700,000
Amounts available to borrow	408,300,000		341,700,000
Obligations under capital leases
Debt Instrument [Line Items]
Total long-term debt	63,700,000		$ 57,300,000
Minimum | Revolving credit facility
Debt Instrument [Line Items]
Average borrowings	151,500,000	$ 160,000,000.0
Maximum | Revolving credit facility
Debt Instrument [Line Items]
Average borrowings	$ 499,300,000	$ 390,000,000.0