Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities:
Net income	$ 13,918	$ 11,687
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	12,519	13,957
Amortization of intangibles	4,119	4,286
Amortization of deferred grants	(85)	(95)
Impairment losses		1,582
Unrealized foreign currency transaction (gains) losses, net	474	573
Stock-based compensation expense	1,860	1,890
Deferred income tax provision (benefit)	973	530
Unrealized (gains) losses and premiums on financial instruments, net	280	(494)
(Earnings) losses from equity method investees	615	179
Other	710	153
Changes in assets and liabilities, net of acquisitions:
Receivables, net	1,450	(2,320)
Prepaid expenses	(4,570)	1,103
Other current assets	68	(359)
Deferred charges and other assets	213	(1,961)
Accounts payable	(5,124)	(15)
Income taxes receivable / payable	478	1,664
Accrued employee compensation and benefits	559	6,866
Other accrued expenses and current liabilities	(1,541)	2,179
Deferred revenue and customer liabilities	(761)	(3,507)
Other long-term liabilities	1,206	198
Operating lease assets and liabilities	1,188	1,207
Net cash provided by operating activities	28,549	39,303
Cash flows from investing activities:
Capital expenditures	(11,818)	(5,696)
Other	5	(35)
Net cash (used for) investing activities	(11,813)	(5,731)
Cash flows from financing activities:
Payments of long-term debt	(21,000)	(9,000)
Proceeds from issuance of long-term debt	23,000
Cash paid for repurchase of common stock	(22,909)
Shares repurchased for tax withholding on equity awards	(1,009)	(1,269)
Cash paid for loan fees related to long-term debt		(1,091)
Other		(6)
Net cash (used for) financing activities	(21,918)	(11,366)
Effects of exchange rates on cash, cash equivalents and restricted cash	(3,920)	(862)
Net increase (decrease) in cash, cash equivalents and restricted cash	(9,102)	21,344
Cash, cash equivalents and restricted cash – beginning	129,185	130,231
Cash, cash equivalents and restricted cash – ending	120,083	151,575
Supplemental disclosures of cash flow information:
Cash paid during period for interest	567	946
Cash paid during period for income taxes	3,799	2,862
Cash paid for amounts included in the measurement of operating lease liabilities	13,578	13,146
Non-cash transactions:
Net right-of-use assets arising from new or remeasured operating lease liabilities	9,095	6,581
Property and equipment additions in accounts payable	4,154	3,669
Unrealized gain (loss) on postretirement obligation, net of taxes, in accumulated other comprehensive income (loss)	(22)	(5)
Shares repurchased for tax withholding on equity awards included in current liabilities	$ 33	$ 102