Share-Based Compensation - Stock Options Status and Activity (Details) - Stock Option - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Shares Under Option
Shares Under Option Outstanding Beginning Balance (in shares)	272,870
Granted (in shares)	0
Exercised (in shares)	0
Forfeited (in shares)	(165,840)
Shares Under Option Outstanding Ending Balance (in shares)	107,030	272,870
Weighted Avg. Exercise Prices
Weighted Average Exercise Prices, Outstanding, Beginning Balance (in dollars per share)	$ 47.41
Granted (in dollars per share)	0
Exercised (in dollars per share)	0
Forfeited (in dollars per share)	38.98
Weighted Average Exercise Prices, Outstanding, Ending Balance (in dollars per share)	$ 56.26	$ 47.41
Weighted Average Remaining Life in Years	14 days	6 months
Aggregate Intrinsic Value, Outstanding, Beginning Balance	$ 0
Aggregate Intrinsic Value, Outstanding, Ending Balance	$ 0	$ 0