CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Operating Activities:
Net income	$ 84,154	$ 71,777
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	57,914	53,856
Amortization of intangibles	7,131	6,517
Impairment charges	4,270	0
Share-based compensation expense	11,694	10,909
Equity in earnings of affiliates, net of dividends related to earnings	2,307	(1,415)
Loss on refinancing and extinguishment of debt	1,020	0
Other	9,829	947
Changes in operating assets and liabilities	(114,141)	(27,350)
Net cash provided by operating activities	64,178	115,241
Investing activities:
Capital expenditures	(98,149)	(81,429)
Loan to affiliate	0	(4,906)
Acquisition of businesses, net of cash acquired	0	(3,020)
Proceeds from sale of fixed assets and other	348	73
Net cash used in investing activities	(97,801)	(89,282)
Financing activities:
Principal payments on long-term debt	(11,297)	(4,886)
Increase in short-term debt, net	541	1,331
Restricted cash deposit for overdraft facility	0	(25,000)
Repurchase of common stock	(7,514)	(23,800)
Proceeds from exercise of warrants	707	413
Taxes withheld and paid on employees' share based payment awards	(11,671)	(4,896)
Other	(792)	43
Net cash used in financing activities	(30,026)	(56,795)
Effects of exchange rate changes on cash and cash equivalents	(16,257)	(7,861)
Changes in cash and cash equivalents	(79,906)	(38,697)
Cash and cash equivalents at beginning of period	480,092	378,243
Cash and cash equivalents at end of period	$ 400,186	$ 339,546