Equity-Based Compensation Fair Value of Options Granted and Major Assumptions Used (Details) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value	$ 6.82	$ 10.11	$ 15.16
Risk free interest rate, minimum	1.31%	0.97%	0.63%
Risk free interest rate, maximum	1.34%	1.84%	1.04%
Weighted average risk-free interest rate	1.38%	1.31%	1.00%
Expected price volatility range, minimum	36.10%	51.50%	55.90%
Expected price volatility range, maximum	37.30%	58.50%	56.50%
Weighted average expected price volatility	36.77%	37.10%	58.30%
Expected dividend yield	0.37%	0.25%	0.27%
Expected term in years at the date of grant	4 years 6 months	4 years 6 months	5 years 6 months
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value	$ 20.92	$ 31.40	$ 30.06
Performance Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value	$ 21.69	$ 31.57	$ 30.12