Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
OPERATING ACTIVITIES
Net income	$ 55,862	$ 61,558
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	31,596	30,243
Interest accretion of convertible notes discount	7,917	7,317
Employee share-based compensation expense	7,613	6,782
Financing costs amortization	979	979
Unrealized foreign currency transaction loss (gain)	2,295	(51)
Other non-cash operating activities	(67)	4,049
Changes in asset and liabilities, net of acquisitions:
Accounts receivable	39,771	(60,051)
Inventory	(19,106)	(12,071)
Unbilled contract revenues and other assets	(40,301)	(16,424)
Accounts payable and other liabilities	(11,361)	(17,952)
Customer advances and billings in excess of contract revenue	(9,093)	15,054
Net Cash Provided By Operating Activities	66,105	19,433
INVESTING ACTIVITIES
Capital expenditures	(42,886)	(50,809)
Proceeds from sale of assets	1,692	64
Acquisition of businesses, net of cash acquired	(11,943)	(2,965)
Net Cash Used In Investing Activities	(53,137)	(53,710)
FINANCING ACTIVITIES
Borrowings on revolving credit facilities	7,884	173,550
Repayments on revolving credit facilities	(3,252)	(136,782)
Principal payments on long-term debt	(2,813)	(2,813)
Proceeds from exercise of stock options	706	5,285
Excess tax benefit from share-based compensation	1,753	5,495
Payment of contingent consideration	(741)	0
Common stock repurchases	(3,326)	(1,979)
Dividend distribution to noncontrolling interest	(1,206)	(1,369)
Net Cash (Used In) Provided By Financing Activities	(995)	41,387
Effect of exchange rate changes on cash	(8,896)	3,220
Net increase in cash and cash equivalents	3,077	10,330
Cash and cash equivalents at beginning of period	137,345	141,498
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 140,422	$ 151,828