Dividends and Earnings per Share - Narrative (Details) - shares	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Restricted Stock Units (RSUs)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Participating securities (in shares)	497,492	525,986
Restricted Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Participating securities (in shares)	0	128,500
Restricted Stock and Restricted Stock Units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Unvested awards (in shares)	497,492	654,486