Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net income	$ 11,687	$ 10,948
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	13,957	14,964
Amortization of intangibles	4,286	4,213
Amortization of deferred grants	(95)	(181)
Impairment losses	1,582	3,526
Unrealized foreign currency transaction (gains) losses, net	573	194
Stock-based compensation expense	1,890	2,077
Deferred income tax provision (benefit)	530	584
Unrealized (gains) losses and premiums on financial instruments, net	(494)	168
Amortization of deferred loan fees	69	67
Other	263	150
Changes in assets and liabilities, net of acquisitions:
Receivables, net	(2,320)	(2,120)
Prepaid expenses	1,103	(134)
Other current assets	(359)	665
Deferred charges and other assets	(1,961)	(1,496)
Accounts payable	(15)	(4,413)
Income taxes receivable / payable	1,664	(1,622)
Accrued employee compensation and benefits	6,866	(1,832)
Other accrued expenses and current liabilities	2,179	3,766
Deferred revenue and customer liabilities	(3,507)	(2,976)
Other long-term liabilities	198	2,071
Operating lease assets and liabilities	1,207
Net cash provided by operating activities	39,303	28,619
Cash flows from investing activities:
Capital expenditures	(5,696)	(13,258)
Cash paid for business acquisitions, net of cash acquired	(61)
Purchase of intangible assets		(7,505)
Other	26	2
Net cash (used for) investing activities	(5,731)	(20,761)
Cash flows from financing activities:
Payments of long-term debt	(9,000)	(175,000)
Shares repurchased for tax withholding on equity awards	(1,269)	(3,682)
Cash paid for loan fees related to long-term debt	(1,091)
Other	(6)	20
Net cash (used for) financing activities	(11,366)	(178,662)
Effects of exchange rates on cash, cash equivalents and restricted cash	(862)	(332)
Net increase (decrease) in cash, cash equivalents and restricted cash	21,344	(171,136)
Cash, cash equivalents and restricted cash – beginning	130,231	344,805
Cash, cash equivalents and restricted cash – ending	151,575	173,669
Supplemental disclosures of cash flow information:
Cash paid during period for interest	946	1,042
Cash paid during period for income taxes	2,862	4,754
Non-cash transactions:
Property and equipment additions in accounts payable	3,669	4,430
Unrealized gain (loss) on postretirement obligation, net of taxes, in accumulated other comprehensive income (loss)	(5)	(10)
Shares repurchased for tax withholding on equity awards included in current liabilities	$ 102	$ 357