Share-Based Payments (Options and Stock Appreciation Rights Outstanding) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Shares Available For Grant
Shares Available For Grant, Beginning Balance (in shares)			291,000
Shares Available For Grant, Exercised (in shares)			0
Shares Available For Grant, Forfeited (in shares)			0
Shares Available For Grant, Expired (in shares)			0
Shares Available For Grant, Granted (in shares)			0
Shares Available For Grant, Ending Balance (in shares)	291,000		291,000
Shares/Awards
Opening Balance (in shares)			0
Exercised (in shares)			0
Forfeited (in shares)			0
Expired (in shares)			0
Granted (in shares)			0
Ending Balance (in shares)	0		0
Weighted-Average Exercise Price (usd per share)
Beginning Balance (in dollars per share)			$ 0
Exercised (in dollars per share)			0
Forfeited (in dollars per share)			0
Expired (in dollars per share)			0
Granted (in dollars per share)			0
Ending Balance (in dollars per share)	$ 0		$ 0
Liability Awards
Total intrinsic value of options exercised			$ 2,500,000	$ 2,200,000
Total share-based liabilities paid			2,500,000	2,200,000
Fair value of vested awards			3,000,000.0	800,000
Cash received from exercise of stock options	$ 0	$ 0	$ 0	$ 0
SAR
Liability Awards
Opening balance (in shares)			89,443
Exercised (in shares)			0
Forfeited (in shares)			(1,230)
Granted (in shares)			0
Closing balance (in shares)	88,213		88,213
RSU
Liability Awards
Opening balance (in shares)			13,170
Exercised (in shares)			(3,051)
Forfeited (in shares)			(307)
Granted (in shares)			0
Closing balance (in shares)	9,812		9,812
PSU
Liability Awards
Opening balance (in shares)			19,122
Exercised (in shares)			(5,426)
Forfeited (in shares)			(616)
Granted (in shares)			0
Closing balance (in shares)	13,080		13,080