Stock-Based Compensation - Valuation Assumptions (Details) - $ / shares		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Weighted average fair value of grants	[1]	$ 0.00	$ 0.00	$ 24.77	$ 13.64
Risk-free interest rate		0.00%	0.00%	1.38%	1.29%
Expected volatility		0.00%	0.00%	43.50%	44.84%
Expected life in years				4 years 6 months 21 days	4 years 6 months 21 days

[1] The weighted average fair value of grants was calculated utilizing the stock options granted during each respective period.