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Summary of Significant Accounting Policies - Balance Sheet Impact of ASU 2016-02 Adoption (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
ASSETS      
Prepaid expenses and other current assets $ 38,687 $ 35,454 $ 35,997
Total current assets 771,949 857,356 857,899
Operating lease right-of-use assets, net 34,063 39,110 0
Total assets 992,507 1,081,943 1,043,376
Liabilities [Abstract]      
Other accrued liabilities 171,873 210,381 199,472
Total current liabilities 314,987 394,901 383,992
Non-current operating lease liabilities 29,263 33,823 0
Other non-current liabilities 7,907 6,067 12,232
Total liabilities 370,435 454,391 415,824
Total liabilities and stockholders’ equity $ 992,507 1,081,943 $ 1,043,376
ASU 2016-02      
ASSETS      
Prepaid expenses and other current assets   (543)  
Total current assets   (543)  
Operating lease right-of-use assets, net   39,110  
Total assets   38,567  
Liabilities [Abstract]      
Other accrued liabilities   10,909  
Total current liabilities   10,909  
Non-current operating lease liabilities   33,823  
Other non-current liabilities   (6,165)  
Total liabilities   38,567  
Total liabilities and stockholders’ equity   $ 38,567