Share-Based Compensation (Details 1) - Share-Based Compensation, General			12 Months Ended								1 Months Ended					12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Stock Options	Dec. 31, 2012 Stock Options	Dec. 31, 2011 Stock Options	Dec. 31, 2013 Stock Options Vests ratably over service-period	Dec. 31, 2013 Stock Options Cliff-vests at end of service period	Dec. 31, 2013 Stock Options Minimum	Dec. 31, 2013 Stock Options, 7-year term	Dec. 31, 2013 Stock Options, 10-year term	Jan. 31, 2012 Amended and Restated 2007 Long-Term Incentive Plan	Jan. 31, 2011 Amended and Restated 2007 Long-Term Incentive Plan	Dec. 31, 2013 Amended and Restated 2007 Long-Term Incentive Plan	Dec. 31, 2012 Amended and Restated 2007 Long-Term Incentive Plan	Dec. 31, 2013 Amended and Restated 2007 Long-Term Incentive Plan Stock Options	Dec. 31, 2013 Amended and Restated 2007 Long-Term Incentive Plan Stock Options Minimum	Dec. 31, 2013 Amended and Restated 2007 Long-Term Incentive Plan Granted before the 2012 annual meeting of the stockholders Restricted stock, restricted stock units, performance units and performance shares	Dec. 31, 2013 Amended and Restated 2007 Long-Term Incentive Plan Granted after the 2012 annual meeting of the stockholders Restricted stock, restricted stock units, performance units and performance shares	Dec. 31, 2013 Other Stock Plans
Share-Based Compensation
Minimum exercise price of a stock option, as a percentage of the fair market value of a share of common stock as of the date of grant								100.00%								100.00%
Increase in shares available under Stock Plans											5,900,000	5,800,000
Number of shares deducted from shares available for issuance under Stock Plans for each share granted under Plan															1		1	1.76
Terms of options granted			7 years	7 years	7 years			7 years	7 years	10 years
Stock options vesting period			4 years			4 years	3 years
Shares authorized	43,041,212												28,789,197						14,252,015
Stock options outstanding	9,487,570	9,032,512
Shares outstanding	13,025,841	11,832,742											12,016,730						1,009,111
Shares available for future grants	5,760,151												5,760,151	12,000,000					0