Stock-Based Compensation - Nonvested Restricted Stock Unit Activity (Details) - Nonvested Restricted Stock Units	12 Months Ended
	Dec. 31, 2015 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested beginning balance (in Shares) | shares	1,122,553
Granted (in Shares) | shares	299,378
Vested (in Shares) | shares	(446,127)
Forfeited (in Shares) | shares	(2,566)
Nonvested ending balance (in Shares) | shares	973,238
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Nonvested, weighted-average grant date fair value, beginning balance (in Dollars per share) | $ / shares	$ 21.06
Granted, weighted-average grant date fair value (in Dollars per share) | $ / shares	35.48
Vested, weighted-average grant date fair value (in Dollars per share) | $ / shares	19.06
Forfeited, weighted-average grant date fair value (in Dollars per share) | $ / shares	25.86
Nonvested, weighted-average grant date fair value, ending balance (in Dollars per share) | $ / shares	$ 26.93