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Restricted Cash (Tables) | 12 Months Ended
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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 |  |
﻿

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