Share-Based Compensation - Restricted Stock Units (Details) - shares	1 Months Ended		12 Months Ended
	Nov. 30, 2017	Nov. 30, 2014	Dec. 31, 2018	Dec. 31, 2017
Number of Shares
Outstanding at beginning of year (in shares)			1,167,320
Granted (in shares)			0
Canceled/forfeited (in shares)			(349,077)
Vested/Paid (in shares)			(330,838)
Outstanding at end of year (in shares)			487,405	1,167,320
MRSU
Number of Shares
Outstanding at beginning of year (in shares)			277,733
Granted (in shares)	270,269	60,767	0
Canceled/forfeited (in shares)			(270,269)
Vested/Paid (in shares)			(7,464)
Outstanding at end of year (in shares)			0	277,733
RSU
Number of Shares
Outstanding at beginning of year (in shares)			889,587
Granted (in shares)			0
Canceled/forfeited (in shares)			(78,808)
Vested/Paid (in shares)			(323,374)	(31,703)
Outstanding at end of year (in shares)			487,405	889,587