Condensed Consolidated Balance Sheets (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Assets
Cash and cash equivalents	$ 71,794	$ 85,996
Accounts receivable (less allowance for doubtful accounts of $3,169 at September 30, 2011 and $3,103 at December 31, 2010)	147,632	151,006
Inventory	6,957	7,324
Prepaid expenses	9,038	8,943
Current deferred income tax asset	6,769	8,911
Other current assets	6,258	6,283
Total current assets	248,448	268,463
Property, plant and equipment (less accumulated depreciation of $251,793 at September 30, 2011 and $253,730 at December 31, 2010)	73,105	72,659
Goodwill, net	565,651	565,651
Other intangible assets (less accumulated amortization of $15,531 at September 30, 2011 and $14,942 at December 31, 2010)	15,199	15,788
Other assets	4,630	4,319
Total assets	907,033	926,880
Liabilities and Stockholders' Equity
Current maturities of long-term debt	71,656	133,000
Accounts payable	42,827	56,085
Accrued payroll and related expenses	18,847	24,780
Customer advances and deferred revenue	35,952	36,834
Income taxes payable	828	2,247
Other current liabilities	21,113	28,017
Total current liabilities	191,223	280,963
Long-term debt	113,312	60,000
Other long-term liabilities (including deferred income taxes of $96,102 at September 30, 2011 and $85,655 at December 31, 2010)	154,098	148,094
Total liabilities	458,633	489,057
Stockholders' equity
Common stock, $1 par value per share, 250,000,000 shares authorized. 118,484,579 shares issued at September 30, 2011 and 118,296,334 shares issued at December 31, 2010	118,485	118,296
Additional paid-in capital	340,124	336,795
Retained earnings	1,266,596	1,252,438
Less treasury stock: 55,672,766 shares at cost at September 30, 2011 and 54,664,293 shares at cost at December 31, 2010	(1,244,327)	(1,236,024)
Accumulated other comprehensive loss	(32,478)	(33,682)
Total stockholders' equity	448,400	437,823
Total liabilities and stockholders' equity	$ 907,033	$ 926,880