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Unaudited Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operating activities    
Net loss $ (30,244) $ (2,272)
Adjustments to reconcile net loss to net cash provided by (used) in operating activities    
Depreciation and amortization 46,098 41,013
Unrealized foreign currency exchange rate gains (5,030) (8,313)
Loss on disposal of property and equipment 159 556
Impairment charges 2,248 0
Amortization of bond premium 63 63
Stock-based compensation 8,137 12,082
Excess tax deficiency from stock-based compensation arrangements 0 (1,258)
Deferred income taxes (10,645) 15,905
Changes in reserves and allowances (251,194) (21,187)
Changes in operating assets and liabilities:    
Accounts receivable 53,703 21,261
Inventories 16,697 19,084
Prepaid expenses and other assets (83,917) (6,588)
Other non-current assets (731) 0
Accounts payable (66,894) (90,982)
Accrued expenses and other liabilities (3,933) 7,253
Customer refund liability 350,312 0
Income taxes payable and receivable (2,805) (19,169)
Net cash provided by (used in) operating activities 22,024 (32,552)
Cash flows from investing activities    
Purchases of property and equipment (55,930) (91,790)
Net cash used in investing activities (55,930) (91,790)
Cash flows from financing activities    
Proceeds from long term debt and revolving credit facility 165,000 200,000
Payments on long term debt and revolving credit facility (161,750) (156,750)
Employee taxes paid for shares withheld for income taxes (1,759) (2,474)
Proceeds from exercise of stock options and other stock issuances 2,319 2,782
Payments of debt financing costs (11) 0
Net cash provided by financing activities 3,799 43,558
Effect of exchange rate changes on cash, cash equivalents and restricted cash 2,157 3,452
Net decrease in cash, cash equivalents and restricted cash (27,950) (77,332)
Cash, cash equivalents and restricted cash    
Beginning of period 318,135 252,725
End of period 290,185 175,393
Change in accrual for property and equipment $ (27,641) $ (25,567)