Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Statement of Cash Flows [Abstract]
Net loss	$ (16,779)	$ (28,960)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Share-based compensation	3,501	3,054
Depreciation and amortization expense	18,178	16,371
Loss on extinguishment of debt	11,595	0
Non-cash interest expense	3,661	5,356
Loss on disposal of assets	3,185	0
Deferred taxes	(3,468)	5,012
Changes in assets and liabilities, net of effects of acquisitions:
Accounts receivable, net	(15,853)	(4,663)
Unbilled receivables, net	(16,540)	(2,334)
Inventories, net	(2,297)	(5,829)
Prepaid expenses	(1,596)	(219)
Accounts payable	(11,831)	3,949
Accrued expenses	(2,702)	3,983
Other non-current assets/liabilities	(801)	(1,857)
Net cash (used in) provided by operating activities	(41)	3,189
Cash flows from investing activities:
Acquisitions, net of cash acquired	0	236,091
Purchases of property and equipment	(2,347)	(5,128)
Net cash used in investing activities	(2,347)	(241,219)
Cash flows from financing activities:
Proceeds from issuance of term note	290,000	135,000
Principal payments of term loan	(141,625)	(1,688)
Principal payments of convertible senior notes	(126,892)	0
Settlement of capped call transactions	2,118	0
Payment of debt extinguishment costs	7,482	4,689
Payment of debt extinguishment costs	(711)	0
Proceeds from revolver	25,000	10,000
Repayment of revolver	25,000	10,000
Proceeds from stock issuance, net	0	84,586
Other	(185)	216
Net cash provided by financing activities	15,223	213,425
Net increase (decrease) in cash and cash equivalents	12,835	(24,605)
Cash and cash equivalents at beginning of period	17,832	41,871
Cash and cash equivalents at end of period	30,667	17,266
Supplemental disclosure of cash flow information:
Cash paid for interest	15,088	6,622
Cash (received) paid for income taxes, net	$ (137)
Cash (received) paid for income taxes, net		$ 15