CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Operating Activities:
Net income	$ 42,504	$ 31,537
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	28,262	26,927
Amortization of intangibles	3,595	3,278
Impairment charges	4,270	0
Share-based compensation expense	6,804	4,434
Equity in earnings of affiliates, net of dividends related to earnings	965	1,252
Other	7,661	(362)
Changes in operating assets and liabilities	(90,510)	(39,152)
Net cash provided by operating activities	3,551	27,914
Investing activities:
Capital expenditures	(58,270)	(55,090)
Acquisition of businesses, net of cash acquired	0	(3,020)
Proceeds from sale of fixed assets	33	(127)
Net cash used in investing activities	(58,237)	(58,237)
Financing activities:
Increase in short-term debt, net	142	2,295
Principal payments on long-term debt	(1,836)	(2,436)
Repurchase of common stock	0	(23,800)
Proceeds from exercise of warrants	580	248
Taxes withheld and paid on employees' share based payment awards	(10,740)	(1,714)
Other	(117)	28
Net Cash (used in) provided by financing activities	(11,971)	(25,379)
Effects of exchange rate changes on cash and cash equivalents	(6,510)	(9,464)
Changes in cash and cash equivalents	(73,167)	(65,166)
Cash and cash equivalents at beginning of period	480,092	378,243
Cash and cash equivalents at end of period	$ 406,925	$ 313,077