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Quarterly Financial Data (Schedule Of Quarterly Financial Information) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Quarterly Financial Data [Abstract]
Revenues	$ 521,250	$ 525,951	$ 490,966	$ 514,964	$ 508,444	$ 555,229	$ 601,602	$ 602,820	$ 657,050	$ 640,688	$ 660,591	$ 608,136	$ 2,053,131	$ 2,268,095	$ 2,566,465
Gross profit	50,661	46,354	34,672	43,361	37,313	48,955	49,223	50,037	52,093	48,995	50,548	54,200	175,048	185,528	205,836
Net income (loss)	$ 7,695	$ 5,915	$ (3,407)	$ 3,852	$ (6,931)	$ 7,136	$ 9,447	$ 13,773	$ 27,716	$ 7,799	$ 10,943	$ (23,641)	$ 14,055	$ 23,425	$ 22,817
Earnings (loss) per common share, Basic	$ 0.21	$ 0.16	$ (0.09)	$ 0.10	$ (0.19)	$ 0.19	$ 0.25	$ 0.34	$ 0.64	$ 0.17	$ 0.23	$ (0.49)	$ 0.38	$ 0.61	$ 0.49
Earnings (loss) per common share, Diluted	$ 0.21	$ 0.16	$ (0.09)	$ 0.10	$ (0.19)	$ 0.19	$ 0.24	$ 0.34	$ 0.64	$ 0.17	$ 0.23	$ (0.49)	$ 0.38	$ 0.60	$ 0.49

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