Annual report pursuant to Section 13 and 15(d)

Supplemental Disclosures to Consolidated Statements of Cash Flows (Cash, Cash Equivalents and Restricted Cash) (Details)

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Supplemental Disclosures to Consolidated Statements of Cash Flows (Cash, Cash Equivalents and Restricted Cash) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Supplemental Cash Flow Elements [Abstract]        
Cash and cash equivalents $ 569,520 $ 491,257 $ 573,210  
Restricted cash included in other current assets 6,630 775 938  
Total cash and cash equivalents and restricted cash at end of period $ 576,150 $ 492,032 $ 574,148 $ 488,127