Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash Flows from Operating Activities
Net income (loss)	$ (45,862)	$ (262,414)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	25,838	41,110
Non-cash interest expense	9,418	8,739
Deferred income taxes	20	(28,872)
Share-based compensation expense	11,528	12,720
Asset impairment		252,343
Changes in operating assets and liabilities:
Accounts receivable and contract assets	(16,308)	769
Inventories and deferred cost of sales	17,921	(17,748)
Prepaid expenses and other current assets	(1,276)	10,037
Accounts payable and accrued expenses	(16,000)	(4,006)
Customer deposits and deferred revenue	(6,705)	(47,589)
Income taxes receivable and payable, net	(593)	(3,552)
Other, net	(986)	(915)
Net cash provided by (used in) operating activities	(23,005)	(39,378)
Cash Flows from Investing Activities
Acquisitions of businesses, net of cash acquired		(2,662)
Capital expenditures	(8,189)	(5,788)
Proceeds from the sale of investments	102,230	65,365
Payments for purchases of investments	(148,664)	(72,303)
Proceeds from held for sale assets	645
Net cash provided by (used in) investing activities	(53,978)	(15,388)
Cash Flows from Financing Activities
Cash withholdings for employee stock purchase plan	2,609	3,007
Taxes paid for restricted stock vestings	(2,771)	(3,029)
Purchases of common stock		(11,457)
Net cash provided by (used in) financing activities	(162)	(11,479)
Effect of exchange rate changes on cash and cash equivalents	9	(4)
Net increase (decrease) in cash, cash equivalents, and restricted cash	(77,136)	(66,249)
Cash, cash equivalents, and restricted cash - beginning of period	213,082	280,583
Cash, cash equivalents, and restricted cash - end of period	135,946	214,334
Supplemental Disclosure of Cash Flow Information
Interest paid	9,401	9,655
Income taxes paid	2,835	4,269
Non-cash operating and financing activities
Net transfer of inventory to property, plant and equipment	4,074	$ 1,170
Right-of-use assets obtained in exchange for lease obligations	$ 516