Debt (Details Textual) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	May 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Extinguishment of Debt		$ 20,009	$ 0	$ 0
Loss on debt extinguishments		(1,281)	0	$ (9,342)
Senior Notes due 2024
Debt Instrument [Line Items]
Net unamortized debt issuance costs		3,100	4,100
Debt Instrument, Face Amount	$ 250,000
Proceeds from Debt	$ 245,000
Extinguishment of Debt		20,000
Loss on debt extinguishments		1,300
Senior Notes due Two Thousand Twenty One [Member]
Debt Instrument [Line Items]
Loss on debt extinguishments			9,300
Revolving Credit Facility
Debt Instrument [Line Items]
Net unamortized debt issuance costs		2,300	$ 2,200
Line of Credit Facility, Current Borrowing Capacity		$ 250,000
Stated interest rate		4.20%