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Supplemental Cash Flow Information - Reconciliation of Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Cash, Cash Equivalents and Restricted Cash [Line Items]            
Cash and cash equivalents $ 530,670 $ 377,205 $ 164,798 $ 73,356 $ 85,423 $ 78,687
Total cash, cash equivalents, and restricted cash reported in the statements of cash flows 532,853 381,638 169,745 78,117 89,492 83,256
Prepaid Expenses and Other Current Assets            
Cash, Cash Equivalents and Restricted Cash [Line Items]            
Restricted cash and cash equivalents 1,266 3,514 4,026 3,733 3,038 3,286
Other Assets            
Cash, Cash Equivalents and Restricted Cash [Line Items]            
Restricted cash and cash equivalents $ 917 $ 919 $ 921 $ 1,028 $ 1,031 $ 1,283