CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Operating Activities:
Net income	$ 108,423	$ 90,180
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	81,725	74,459
Amortization of intangibles	9,974	10,819
Share-based compensation expense	18,533	8,348
Equity in earnings, net of dividends related to earnings	(2,801)	(2,125)
Gain on remeasurement of previously held equity interest	0	(14,199)
Deferred income taxes	295	5,765
Other	1,101	127
Changes in operating assets and liabilities	(35,205)	(63,401)
Net cash provided by operating activities	182,045	109,973
Investing activities:
Capital expenditures	(116,788)	(129,661)
Acquisition of businesses, net of cash acquired	(37,478)	(34,396)
Investment in joint ventures	0	(4,300)
Cash from consolidation of joint venture	3,395	0
Proceeds from sale of fixed assets	156	4,846
Net cash used in investing activities	(150,715)	(163,511)
Financing activities:
Increase in short-term debt, net	1,703	973
Principal payments on long-term debt	(9,787)	(6,239)
Purchase of noncontrolling interests	0	(1,262)
Repurchase of common stock	(23,800)	0
Proceeds from exercise of warrants	2,498	8,540
Taxes withheld and paid on employees' share based payment awards	(11,979)	(1,330)
Other	101	(173)
Net Cash (used in) provided by financing activities	(41,264)	509
Effects of exchange rate changes on cash and cash equivalents	(7,880)	17,743
Changes in cash and cash equivalents	(17,814)	(35,286)
Cash and cash equivalents at beginning of period	378,243	267,270
Cash and cash equivalents at end of period	$ 360,429	$ 231,984