Earnings Per Share Narrative (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Outstanding stock options (in shares)	2,615,189	2,200,000	2,615,189	2,200,000	2,084,201
Antidilutive securities excluded from EPS computation (in shares)	1,200,000	500,000	1,200,000	500,000
Performance Vested Restricted Stock Units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
PVRSUs excluded from EPS calculation due to performance conditions not met (in shares)			251,956	213,119