Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 97,204	$ 94,711
Accounts receivable, net (Note 1)	416,789	426,899
Inventories (Note 1)	39,075	43,253
Prepaid expenses and other	30,594	36,589
Total current assets	583,662	601,452
Property, plant and equipment, net (Note 1)	113,602	125,832
Goodwill (Note 2)	632,438	632,438
Other intangible assets, net (Note 2)	211,442	215,171
Other assets	13,414	14,142
Total assets	1,554,558	1,589,035
Current liabilities:
Current portion long-term debt (Note 3)	26,250	22,500
Accounts payable	276,565	281,320
Progress billings	36,319	39,595
Accrued expenses (Note 4)	79,161	107,467
Total current liabilities	418,295	450,882
Long-term debt (Note 3)	557,561	565,061
Deferred income taxes	57,624	57,258
Other non-current liabilities	40,701	42,271
Total liabilities	1,074,181	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 March 31, 2013 and December 31, 2012)	0	0
Common stock ($0.01 par value; 100,000,000 shares authorized; 65,394,999 shares issued at March 31, 2013 and December 31, 2012; 38,859,824 and 38,766,530 shares outstanding at March 31, 2013 and December 31, 2012, respectively)	654	654
Additional paid-in capital	94,738	102,373
Retained earnings	1,138,185	1,128,540
Accumulated other comprehensive income	3,080	3,574
Treasury stock, at cost (26,535,175 and 26,628,469 shares at March 31, 2013 and December 31, 2012, respectively)	(756,280)	(761,578)
Total stockholders' equity	480,377	473,563
Total liabilities and stockholders' equity	$ 1,554,558	$ 1,589,035