Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net cash used in operating activities
Net loss	$ (43,114)	$ (34,503)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	24,757	25,730
Non-cash interest	843	640
Amortization of deferred financing costs	43	56
Losses from investments in investees	2,456	2,131
Equity-based compensation – employees and non-employees	5,936	9,693
Loss (gain) on disposal of fixed assets	(261)	(2,997)
Change in fair value of equity securities and derivative instruments	(3,101)	(4,037)
Change in fair value of contingent consideration	1,759	2,371
Deferred income tax benefit	(2,709)	(9,236)
Changes in assets and liabilities, net of the effects of acquisitions:
Accounts receivable, net	6,757	(17,771)
Inventory, net	204	(50)
Other current assets and prepaid expenses	5,445	4,692
Other assets	(131)	(235)
Accounts payable	(10,206)	19,539
Foreign currency measurement	(11)	(69)
Contract liabilities	(15,358)	(13,849)
Accrued expenses and other liabilities	(8,829)	(16,024)
Net cash used in operating activities	(35,520)	(33,919)
Cash flows from investing activities:
Investments in investees	(1,000)	0
Proceeds from sale of equity securities	1,286	0
Proceeds from the sale of property, plant and equipment	541	3,095
Capital expenditures	(5,973)	(9,537)
Net cash used in investing activities	(5,146)	(6,442)
Cash flows from financing activities:
Issuance of 2033 Senior Notes, net, including related parties	55,000	0
Proceeds from the exercise of Common Stock options and warrants	0	1,866
Borrowings on lines of credit	6,611	7,825
Repayments of lines of credit	(12,420)	(7,517)
Net cash provided by financing activities	49,191	2,174
Effect of exchange rate changes on cash and cash equivalents	(81)	506
Net increase (decrease) in cash and cash equivalents	8,444	(37,681)
Cash and cash equivalents at beginning of period	91,499	168,733
Cash and cash equivalents at end of period	99,943	131,052
SUPPLEMENTAL INFORMATION:
Interest paid	641	550
Income taxes paid, net of refunds	2,292	848
Shares issued upon the conversion of:
Common Stock options and warrants, surrendered in net exercise	$ 0	$ 696