Stock-Based Compensation - Summary of the Company's Service Based RSU Activity (Details) - RSUs - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Summary of the Company's RSU activity
Outstanding at the beginning of the period	500,000	600,000	800,000
Granted	100,000	100,000	200,000
Issued	(100,000)	(200,000)	(400,000)
Outstanding at the end of the period	462,556	500,000	600,000
Weighted-Average Grant Date Fair Value
Outstanding at the beginning of the period	$ 27.76	$ 23.79	$ 18.90
Granted	43.96	42.76	28.95
Issued	28.95	24.13	15.70
Outstanding at the end of the period	$ 31.73	$ 27.76	$ 23.79