Current and Long-Term Debt - Components of Long-Term Debt (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2019	Apr. 04, 2017	Nov. 19, 2013
Long-Term Debt
Total Debt	$ 1,322,188,000	$ 739,475,000
Less: Current portion	(278,861,000)	0
Total Long-Term Debt	1,043,327,000	739,475,000
Revolving Credit Facility
Long-Term Debt
Total Debt	$ 746,620,000	$ 167,227,000
Weighted average interest rate, as a percent	2.40%	2.30%
Convertible Senior Notes 1.00 percent due December 2020
Long-Term Debt
Total Debt	$ 278,861,000	$ 275,703,000
Interest rate, as a percentage	1.00%	1.00%		1.00%
Aggregate principle amount	$ 287,500,000			$ 287,500,000
Unamortized discount and capitalized debt issuance costs	8,639,000	$ 11,797,000
Senior Notes 5.50 Percent Due 2025
Long-Term Debt
Total Debt	$ 296,707,000	$ 296,545,000
Interest rate, as a percentage	5.50%	5.50%	5.50%
Aggregate principle amount	$ 300,000,000.0		$ 300,000,000.0
Capitalized debt issuance costs	$ 3,300,000	$ 3,500,000