Plan Information (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2009
Incentive Compensation Plan Initiation Year	May 01, 2009
Performance condition of awards	range from 0% to 300% of the target amount
Maximum award value per employee	$ 6.0
Restricted Cash Plan Initiation Year	Mar. 01, 2009
Stock options
Number of shares initially available for grant		8.1
Stock option expiration period in years	10 years
Stock options | Minimum
Award vesting period, years	2 years
Stock options | Maximum
Award vesting period, years	4 years
Other Stock-based Awards
Number of shares initially available for grant		26.5
Award vesting period, years	3 years