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Quarterly Financial Data (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]                      
Revenue $ 145,853 $ 128,986 $ 132,085 $ 115,569 $ 118,322 $ 108,083 $ 117,659 $ 110,731 $ 522,493 $ 454,795 $ 487,531
Gross profit 24,311 20,204 21,331 8,896 7,141 9,411 11,811 8,827 74,742 37,190  
Operating loss (20,601) (13,591) (23,782) (34,907) (109,086) (35,080) (33,966) (36,610) (92,881) (214,742) (163,362)
Net income (loss) $ (15,898) $ (6,999) $ (25,763) $ (42,073) $ (109,140) $ 2,296 $ (25,950) $ (26,663) $ (90,733) $ (159,457) $ (156,079)
Income (Loss) per common share:                      
Basic and diluted (USD per share) $ (0.07) $ (0.03) $ (0.12) $ (0.19) $ (0.49) $ 0.01 $ (0.12) $ (0.12) $ (0.41) $ (0.72) $ (0.77)
Inventory impairment         $ 51,200       $ 0 $ 51,181 $ 0
Accounts receivable write-off (recovery)         $ 15,000       $ (4,862) $ 15,022 $ 0