Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net income	$ 59,607	$ 133,887	$ 111,657
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	494,200	464,706	410,346
Amortization of deferred debt issuance costs and premiums	1,665	2,237	2,880
Deferred income taxes	(697)	(17,190)	(8,256)
Equity in earnings of unconsolidated affiliate	(20,107)	(31,654)	(10,316)
Loss on debt retirement	2,530	0	11,619
Loss (gain) on disposal of fixed assets, net	1,190	1,276	(2,545)
Share-based compensation	3,852	3,700	2,971
Loss from acquisition of J-Devices	13,878	0	0
Gain on sale of subsidiary to J-Devices	0	(9,155)	0
Other, net	4,014	869	(712)
Changes in assets and liabilities, net of acquisitions:
Accounts receivable	122,840	(80,775)	(531)
Inventories	27,677	(27,817)	38,248
Other current assets	(3,309)	(8,747)	10,873
Other assets	(333)	(954)	3,709
Trade accounts payable	(48,368)	55,693	(67,198)
Accrued expenses	(42,042)	16,720	32,001
Pension and severance obligations	(7,321)	(509)	20,748
Other non-current liabilities	(31,997)	109,714	9,460
Net cash provided by operating activities	577,945	613,909	557,536
Cash flows from investing activities:
Payments for property, plant and equipment	(537,975)	(681,120)	(566,256)
Proceeds from sale of property, plant and equipment	6,945	2,815	27,209
Acquisition of business, net of cash acquired	22,577	0	(41,865)
Investment in J-Devices	(12,908)	0	(67,372)
Disposition of business to J-Devices, net of cash transferred	8,355	(15,774)	0
Lease payments from J-Devices	0	0	8,843
Purchase of short-term investment	0	(20,000)	0
Proceeds from short-term investment	0	20,000	0
Other investing activities	(1,356)	(399)	(1,053)
Net cash used in investing activities	(514,362)	(694,478)	(640,494)
Cash flows from financing activities:
Borrowings under revolving credit facilities	290,000	0	5,000
Payments under revolving credit facilities	150,000	0	5,000
Proceeds from issuance of long-term debt	400,000	80,000	375,000
Payments of long-term debt	(530,000)	(145,000)	(80,000)
Payments for debt issuance costs	(312)	(903)	(3,216)
Payments for retirement of debt	0	0	(11,619)
Payment of deferred consideration for an acquisition	0	(18,763)	0
Proceeds from issuance of stock through share-based compensation plans	931	6,250	446
Payments of tax withholding for restricted shares	(730)	(1,579)	(466)
Subsidiary dividends paid to noncontrolling interest	(246)	0	0
Net cash provided by (used in) financing activities	9,643	(79,995)	280,145
Effect of exchange rate fluctuations on cash and cash equivalents	0	68	207
Net increase (decrease) in cash and cash equivalents	73,226	(160,496)	197,394
Cash and cash equivalents, beginning of period	449,946	610,442	413,048
Cash and cash equivalents, end of period	523,172	449,946	610,442
Cash paid during the period for:
Interest	96,227	100,650	100,577
Income taxes	35,084	37,315	18,318
Non-cash investing and financing activities:
Property, plant and equipment included in capital expenditures payable	242,980	127,568	104,800
Common stock issuance for conversion and exchange in 2014 and 2013, respectively, of 6.0% convertible senior subordinated notes due April 2014, $150 million related party in 2013	$ 0	$ 56,350	$ 193,650