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Supplemental Cash Flow Information - Reconciliation of Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Cash, Cash Equivalents and Restricted Cash [Line Items]            
Cash and cash equivalents $ 216,935 $ 530,670 $ 164,798 $ 80,044 $ 73,356 $ 78,687
Total cash, cash equivalents, and restricted cash reported in the statements of cash flows 219,102 532,853 169,745 84,511 78,117 83,256
Prepaid Expenses and Other Current Assets            
Cash, Cash Equivalents and Restricted Cash [Line Items]            
Restricted cash and cash equivalents 1,252 1,266 4,026 3,441 3,733 3,286
Other Assets            
Cash, Cash Equivalents and Restricted Cash [Line Items]            
Restricted cash and cash equivalents $ 915 $ 917 $ 921 $ 1,026 $ 1,028 $ 1,283