Stock-Based Compensation - Performance Shares Activity (Details) - Performance Shares	6 Months Ended
	Jun. 30, 2016 $ / shares shares
Number of PSUs
Outstanding beginning balance (in shares) | shares	143,400
Granted (in shares) | shares	385,100
Vested and issued (in shares) | shares	0
Forfeited (in shares) | shares	(35,500)
Outstanding ending balance (in shares) | shares	493,000
Weighted Average Grant Date Fair Value per Share
Outstanding beginning balance (in dollars per share) | $ / shares	$ 38.69
Granted (in dollars per share) | $ / shares	46.50
Vested and Issued (in dollars per share) | $ / shares	0.00
Forfeited (in dollars per share) | $ / shares	43.64
Outstanding ending balance (in dollars per share) | $ / shares	$ 44.43