CONSOLIDATED BALANCE SHEET (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Accounts receivable, allowance (in dollars)	$ 9,523	$ 8,540
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment (in dollars)	$ 277,498	$ 265,298
Treasury stock, shares	184,182,001	184,945,527
Common Stock
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, authorized shares	1,600,000,000	1,600,000,000
Common stock, issued shares	250,982,079	250,982,079
Common stock, outstanding shares	77,168,078	76,404,552
Class B Convertible Common Stock
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, authorized shares	400,000,000	400,000,000
Common stock, issued shares	16,157,499	16,157,499
Common stock, outstanding shares	5,789,499	5,789,499