Capital Stock and Repurchase Program (Details) - USD ($)		3 Months Ended	9 Months Ended
	May 27, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, remaining authorized repurchase amount			$ 51,900,000
Shares repurchased (in shares)			0	2,537,833
Value of shares repurchased		$ 3,494,000		$ 19,031,000
Number of shares called by each right (in shares)	1
Series D Junior Participating Preferred Stock
Equity, Class of Treasury Stock [Line Items]
Number of shares called by each right (in shares)	0.001
Temporary equity, par value (in dollars per share)	$ 0.01
Purchase price (in dollars per share)	$ 12.00
Percentage threshold where the Rights become exercisable for two times the purchase price	10.00%
Multipler of purchase Price	200.00%
Convertible Notes
Equity, Class of Treasury Stock [Line Items]
Face amount repurchased			$ 33,100,000		$ 0
Cost of repurchase			$ 29,100,000