Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 88,645	$ 94,711
Accounts receivable, net (Note 1)	388,025	426,899
Inventories (Note 1)	36,052	43,253
Prepaid expenses and other	55,021	36,589
Total current assets	567,743	601,452
Property, plant and equipment, net (Note 1)	112,846	125,832
Goodwill (Note 2)	632,438	632,438
Other intangible assets, net (Note 2)	207,713	215,171
Other assets	13,668	14,142
Total assets	1,534,408	1,589,035
Current liabilities:
Current portion long-term debt (Note 3)	30,000	22,500
Accounts payable	268,009	281,320
Progress billings	37,259	39,595
Accrued expenses (Note 4)	97,431	107,467
Total current liabilities	432,699	450,882
Long-term debt (Note 3)	535,004	565,061
Deferred income taxes	57,842	57,258
Other non-current liabilities	40,130	42,271
Total liabilities	1,065,675	1,115,472
Commitments and contingencies (Note 5)
Stockholders' equity:
Preferred stock ($0.01 par value; 25,000,000 shares authorized; no shares issued or outstanding at June 30, 2013 and December 31, 2012)	0	0
Common stock ($0.01 par value; 100,000,000 shares authorized; 65,394,999 shares issued at June 30, 2013 and December 31, 2012; 37,731,308 and 38,766,530 shares outstanding at June 30, 2013 and December 31, 2012, respectively)	654	654
Additional paid-in capital	96,089	102,373
Retained earnings	1,153,275	1,128,540
Accumulated other comprehensive income	2,889	3,574
Treasury stock, at cost (27,663,691 and 26,628,469 shares at June 30, 2013 and December 31, 2012, respectively)	(784,174)	(761,578)
Total stockholders' equity	468,733	473,563
Total liabilities and stockholders' equity	$ 1,534,408	$ 1,589,035