Quarterly report pursuant to Section 13 or 15(d)

Additional Cash Flow Information (Details)

v3.19.2
Additional Cash Flow Information (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Supplemental Cash Flow Information [Abstract]        
Property, plant and equipment and other non-current assets non-cash accruals $ 415 $ 3,485    
2019 Term Loan paid-in-kind election 240 0    
Non-cash settlement of withholding taxes associated with the 2018 and 2017 bonus paid and vesting of certain awards, respectively 6,686 5,583    
Non-cash settlement of the 2018 and 2017 bonus paid, respectively 18,396 15,140    
Non-cash movement for funds deposited in escrow 400      
Cash and cash equivalents 104,005 196,846 $ 133,714  
Non-current restricted cash 17,968 0 49,875  
Total cash, cash equivalents and restricted cash shown in the statements of cash flows $ 121,973 $ 196,846 $ 183,589 $ 128,273