Quarterly report pursuant to Section 13 or 15(d)

Supplemental Cash Flow Information - Cash and Restricted Cash Reconciliation (Details)

v3.8.0.1
Supplemental Cash Flow Information - Cash and Restricted Cash Reconciliation (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Supplemental Cash Flow Elements [Abstract]        
Cash and cash equivalents $ 58,834 $ 66,195 $ 54,126  
Restricted cash included in prepaid and other current assets 1,182   8,985  
Total cash, cash equivalents and restricted cash shown in the condensed consolidated statements of cash flows $ 60,016 $ 67,243 $ 63,111 $ 85,077