Stock Based Compensation (Stock based compensation expense) (Details) - Selling, general and administrative expenses [Member] - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation		$ 12,462	$ 11,315	$ 6,769
Restricted stock units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation	[1]	12,462	11,133	6,006
Restricted stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation		0	100	436
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation		$ 0	$ 82	$ 327

[1] Includes service-based and performance-based restricted stock units.