Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Operating activities:
Net income	$ 62,060	$ 63,303
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	38,639	39,642
Gain on disposition of property, plant and equipment	(286)	(1,302)
Stock compensation expense	5,947	4,890
Withholding taxes paid on stock issuances	(465)	(746)
Changes in assets and liabilities:
Accounts receivable	(11,036)	(8,902)
Inventories	4,755	(2,768)
Prepaid expenses and other current assets	(2,378)	(10,448)
Accounts payable	8,014	14,742
Accrued liabilities	8,453	(14,202)
Deferred income taxes	(536)	629
Long-term retirement benefits	(16,199)	(745)
Other	(459)	1,818
Net cash provided by operating activities	96,509	85,911
Investing activities:
Proceeds from disposition of property, plant and equipment	439	2,058
Capital expenditures	(22,987)	(22,376)
Business acquisitions	(1,546)	0
Component Repair Program payments	(900)	(19,000)
Other	0	(651)
Net cash used by investing activities	(24,994)	(39,969)
Financing activities:
Net change in other borrowings	(2,349)	13,738
Payments on long-term debt	(127,484)	(85,821)
Proceeds from the issuance of long-term debt	99,022	68,722
Proceeds from the issuance of common stock	311	9,691
Common stock repurchases	(8,000)	(11,465)
Dividends paid	(13,450)	(13,126)
Excess tax benefit on stock awards	59	1,574
Other	(2,876)	8,487
Net cash used by financing activities	(54,767)	(8,200)
Effect of exchange rate changes on cash flows	652	(1,814)
Increase in cash and cash equivalents	17,400	35,928
Cash and cash equivalents at beginning of period	83,926	46,039
Cash and cash equivalents at end of period	$ 101,326	$ 81,967