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Restricted Cash (Tables)

12 Months Ended

Dec. 31, 2018

Restricted Cash [Abstract]

Schedule of Cash, Cash Equivalents and Restricted Cash



		As of			As of			As of
		December 31, 2018			December 31, 2017			December 31, 2016			Included on Balance Sheet

			(in thousands)
Cash and cash equivalents		$	143,444		$	68,783		$	146,109
Securitization escrow accounts			32,261			32,699			36,607		Restr. cash - current asset
Payment and performance bonds			203			225			179		Restr. cash - current asset
Surety bonds and workers compensation			2,392			2,588			3,075		Other assets - noncurrent
Total cash, cash equivalents, and restr. cash		$	178,300		$	104,295		$	185,970