Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
OPERATING ACTIVITIES
Net income	$ 32,710	$ 36,711
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	20,360	19,963
Interest accretion of convertible notes discount	5,226	4,830
Employee share-based compensation expense	5,883	5,075
Financing costs amortization	653	653
Unrealized foreign currency transaction (gain) loss	(561)	80
Other non-cash operating activities	(361)	3,555
Changes in asset and liabilities, net of acquisitions:
Accounts receivable	23,528	(20,757)
Inventory	(16,824)	(15,963)
Unbilled contract revenues and other assets	(13,261)	(29,308)
Accounts payable and other liabilities	(2,850)	(1,179)
Customer advances and billings in excess of contract revenue	(12,160)	6,722
Net Cash Provided By Operating Activities	42,343	10,382
INVESTING ACTIVITIES
Capital expenditures	(25,665)	(29,226)
Proceeds from sale of assets	1,691	0
Acquisition of businesses, net of cash acquired	11,943	3,032
Net Cash Used In Investing Activities	(35,917)	(32,258)
FINANCING ACTIVITIES
Borrowings on revolving credit facilities	7,884	100,231
Repayments on revolving credit facilities	(3,252)	(97,011)
Principal payments on long-term debt	(1,875)	(1,876)
Proceeds from exercise of stock options	624	4,462
Excess tax benefit from share-based compensation	1,727	4,472
Payment of contingent consideration	741	0
Common stock repurchases	(3,291)	(1,903)
Dividend distribution to noncontrolling interest	1,206	1,369
Net Cash (Used In) Provided By Financing Activities	(130)	7,006
Effect of exchange rate changes on cash	(967)	(846)
Net increase (decrease) in cash and cash equivalents	5,329	(15,716)
Cash and cash equivalents at beginning of period	137,345	141,498
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 142,674	$ 125,782