CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities
Net loss	$ (52,613)	$ (47,695)
Adjustments to reconcile net loss to cash (used in) provided by operating activities
Depreciation and amortization	62,050	57,733
Equity-based compensation expense	9,116	8,528
Amortization of deferred financing costs	246	82
Deferred tax benefit	(20,320)	(9,071)
Provision for bad debts	371	10,374
Gain on sale of assets	(1,262)	(1,049)
Changes in fair value of investments	(1,474)	(329)
Realized loss on sale of investment	478	0
Unrealized (gain) loss on derivatives	730	(319)
Other	(1,876)	0
Changes in operating assets and liabilities
Accounts receivable	(6,697)	68,766
Inventories	5,627	11,378
Other current assets	3,102	3,058
Other assets	1,745	188
Accounts payable	(439)	(2,166)
Deferred revenue	(7,707)	(21,223)
Accrued and other current liabilities	4,839	(17,958)
Other non-current liabilities	(3,383)	(2,260)
Net cash (used in) provided by operating activities	(7,467)	58,037
Cash flows from investing activities
Purchases of property, plant and equipment	(15,197)	(18,371)
Proceeds from sale of assets	2,200	1,957
Proceeds from sale of investments	11,499	0
Purchase of investments	(118)	(838)
Other	(43)	0
Net cash used in investing activities	(1,659)	(17,252)
Cash flows from financing activities
Repayments of borrowings	(154)	(4,960)
Proceeds from borrowings	0	256
Dividends paid on common stock	(33,426)	(46,842)
Dividends paid on preferred stock	0	(1)
Distribution to noncontrolling interest	0	(8,027)
Net treasury shares withheld	(2,249)	(1,396)
Proceeds from the issuance of ESPP shares	1,266	973
Net cash used in financing activities	(34,563)	(59,997)
Effect of exchange rate changes on cash	(887)	(1,776)
Net decrease in cash and cash equivalents	(44,576)	(20,988)
Cash and cash equivalents at beginning of period	319,526	602,359
Cash and cash equivalents at end of period	274,950	581,371
Non-cash transactions:
Change in accounts payable and accrued expenses related to capital expenditures	$ 2,901	$ 739