Consolidated Balance Sheet (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Allowance for doubtful accounts receivable, current	$ 7,676	$ 7,726
4.5% Mandatory Convertible Preferred Stock, Par or Stated Value Per Share	$ 0.01	$ 0.00
4.5% Mandatory Convertible Preferred Stock, Shares Authorized	20,000,000	0
4.5% Mandatory Convertible Preferred Stock, shares issued	9,775,000	0
4.5% Mandatory Convertible Preferred Stock, shares outstanding	9,775,000	0
Mandatory redemption and aggregate liquidation value, 4.5% Mandatory Convertible Preferred Stock	$ 977,500	$ 0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	600,000,000	600,000,000
Common stock, shares issued	334,070,016	293,164,786
Common stock, shares outstanding	334,070,016	293,164,786