Debt (Details Textual) - USD ($) shares in Thousands, $ in Thousands		1 Months Ended		3 Months Ended	12 Months Ended
	Jun. 01, 2020	Oct. 31, 2018	May 31, 2017	Sep. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 14, 2020	Dec. 13, 2020	Sep. 30, 2018
Debt Instrument [Line Items]
Extinguishment of Debt					$ 0	$ 20,009	$ 0
Loss on debt extinguishments					0	(1,281)	$ 0
Book value					253,427	272,751
Common Stock
Debt Instrument [Line Items]
Debt Conversion, Converted Instrument, Shares Issued				4,500
Senior Notes due 2024
Debt Instrument [Line Items]
Net unamortized debt issuance costs					2,400	3,100
Debt Instrument, Face Amount			$ 250,000
Proceeds from Debt			$ 245,000
Loss on debt extinguishments				$ 1,300
Stated interest rate			5.875%
Debt instrument, redemption price, percentage	102.938%
Debt Conversion, Converted Instrument, Amount				$ 20,000
Revolving Credit Facility
Debt Instrument [Line Items]
Net unamortized debt issuance costs					$ 1,500	$ 2,300
Stated interest rate					2.40%
Line of Credit Facility, Maximum Borrowing Capacity		$ 250,000						$ 300,000	$ 250,000	$ 200,000
Letters of Credit Outstanding, Amount					$ 35,000
Line of Credit Facility, Increase (Decrease), Net		$ 50,000
Base Rate [Member] | Minimum | Revolving Credit Facility
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate					1.00%
Base Rate [Member] | Maximum | Revolving Credit Facility
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate					1.75%
London Interbank Offered Rate (LIBOR) [Member] | Minimum | Revolving Credit Facility
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate					2.00%
London Interbank Offered Rate (LIBOR) [Member] | Maximum | Revolving Credit Facility
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate					2.75%