Restricted Cash (Tables)

12 Months Ended

Dec. 31, 2017

Restricted Cash [Abstract]

Schedule Of Cash, Cash Equivalents And Restricted Cash

	As of		As of		As of
	December 31, 2017		December 31, 2016		December 31, 2015		Included on Balance Sheet
		(in thousands)
Cash and cash equivalents	$	68,783	$	146,109	$	118,039
Securitization escrow accounts		32,699		36,607		25,135	Restricted cash - current asset
Payment and performance bonds		225		179		218	Restricted cash - current asset
Surety bonds and workers compensation		2,588		3,075		3,227	Other assets - noncurrent
Total cash, cash equivalents, and restricted cash	$	104,295	$	185,970	$	146,619