Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Operating activities:
Net income	$ 22,752	$ 13,472
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	20,782	16,499
Amortization of convertible debt discount	731	582
Loss (gain) on disposition of property, plant and equipment	78	(54)
Stock compensation expense	1,865	12,657
Withholding taxes paid on stock issuances	(463)	(720)
Changes in assets and liabilities:
Accounts receivable	(32,802)	(16,347)
Inventories	802	(968)
Prepaid expenses and other current assets	(2,763)	(235)
Accounts payable	9,676	7,144
Accrued liabilities	(3,131)	(16,679)
Deferred income taxes	3,834	485
Long-term retirement benefits	(4,964)	801
Other	580	1,020
Net cash provided by operating activities	16,977	17,657
Investing activities:
Proceeds from disposition of property, plant and equipment	382	44
Capital expenditures	(15,074)	(10,050)
Other	(467)	(1,420)
Net cash used by investing activities	(15,159)	(11,426)
Financing activities:
Net change in other borrowings	559	8,737
Payments on long-term debt	(26,151)	(6,245)
Proceeds from the issuance of long-term debt	39,283	21,000
Payment of assumed liability to Otto Männer Holding AG	(19,796)	0
Proceeds from the issuance of common stock	7,262	2,677
Common stock repurchases	(8,389)	(12,856)
Dividends paid	(5,971)	(5,443)
Excess tax benefit on stock awards	2,246	506
Other	(76)	(53)
Net cash (used) provided by financing activities	(11,033)	8,323
Effect of exchange rate changes on cash flows	(230)	(1,038)
(Decrease) increase in cash and cash equivalents	(9,445)	13,516
Cash and cash equivalents at beginning of period	70,856	86,356
Cash and cash equivalents at end of period	$ 61,411	$ 99,872