CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Accounts receivable, allowance	$ 237,143	$ 245,122
Property and equipment, accumulated depreciation	1,778,259	1,522,183
Intangibles, accumulated amortization	$ 483,773	$ 304,323
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, issued
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	450,000,000	450,000,000
Common stock, shares issued	213,163,248	269,724,566
Common stock, shares outstanding	213,163,248	210,997,150
Treasury stock, shares	0	58,727,416