Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net income	$ 29,697	$ 21,183
Depreciation and amortization	124,387	108,338
Other operating activities and non-cash items	(9,525)	(4,274)
Changes in assets and liabilities	20,465	6,699
Net cash provided by operating activities	165,024	131,946
Cash flows from investing activities:
Payments for property, plant and equipment	(106,149)	(95,999)
Proceeds from sale of property, plant and equipment	3,254	726
Investment in J-Devices	(12,908)	0
Other investing activities	(322)	(266)
Net cash used in investing activities	(116,125)	(95,539)
Cash flows from financing activities:
Borrowings under revolving credit facilities	30,000	0
Proceeds from issuance of long-term debt	0	80,000
Payments of long-term debt	(35,000)	(80,000)
Payment of deferred consideration for an acquisition	0	(18,763)
Proceeds from the issuance of stock through share-based compensation plans	574	438
Payments of tax withholding for restricted shares	(230)	(122)
Net cash used in financing activities	(4,656)	(18,447)
Effect of exchange rate fluctuations on cash and cash equivalents	0	183
Net increase in cash and cash equivalents	44,243	18,143
Cash and cash equivalents, beginning of period	449,946	610,442
Cash and cash equivalents, end of period	494,189	628,585
Non cash investing and financing activities:
Property, plant and equipment included in capital expenditures payable	$ 111,646	$ 144,302