Stock Based Compensation Fair Value Assumptions for Stock Options (Details) (Five Year Service Stock Options [Member], USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Five Year Service Stock Options [Member]
Risk-free interest rate	0.88%	0.82%	2.39%
Expected volatility	56.70%	53.08%	48.00%
Expected term (in years)	5 years 6 months	5 years 6 months	5 years 6 months
Weighted average grant date fair value of options granted during the period	$ 11.97	$ 5.85	$ 6.58