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Supplemental Cash Flow Information - Reconciliation of Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents $ 78,687 $ 138,285 $ 112,183 $ 128,771
Total cash, cash equivalents, and restricted cash reported in the statements of cash flows 83,256 143,775 114,410 128,771
Prepaid Expenses and Other Current Assets        
Cash and Cash Equivalents [Line Items]        
Restricted cash 3,286 5,106 1,709 0
Other Assets, Net        
Cash and Cash Equivalents [Line Items]        
Restricted cash $ 1,283 $ 384 $ 518 $ 0