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Supplemental Cash Flow Information - Reconciliation of Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Cash, Cash Equivalents and Restricted Cash [Line Items]        
Cash and cash equivalents $ 101,736 $ 138,285 $ 106,514 $ 112,183
Total cash, cash equivalents, and restricted cash reported in the statements of cash flows 105,280 143,775 107,532 114,410
Prepaid Expenses and Other Current Assets        
Cash, Cash Equivalents and Restricted Cash [Line Items]        
Restricted cash and cash equivalents 3,160 5,106 591 1,709
Other Assets        
Cash, Cash Equivalents and Restricted Cash [Line Items]        
Restricted cash and cash equivalents $ 384 $ 384 $ 427 $ 518