Stockholders' Equity (Rollforward Of Common Stock Table) (Details) - shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Class of Stock [Line Items]
Treasury Stock, Shares, Beginning Balance	894,773
Balance (Outstanding Shares), Beginning	10,221,006
Purchased through share repurchase program (Treasury)	5,000	80,512
Treasury Stock, Shares, Ending Balance	803,154	894,773
Balance (Outstanding Shares), Ending	10,312,625	10,221,006
Common Stock [Member]
Class of Stock [Line Items]
Treasury Stock, Shares, Beginning Balance	894,773	873,374	927,258
Balance (Outstanding Shares), Beginning	10,221,006	10,242,405	10,188,521
Issued for stock-based compensation plans (Treasury)	(96,619)	(59,113)	(53,884)
Issued for stock-based compensation plans (Outstanding)	96,619	59,113	53,884
Purchased through share repurchase program (Treasury)	5,000	80,512
Purchased through share repurchase program (Outstanding)	(5,000)	(80,512)
Treasury Stock, Shares, Ending Balance	803,154	894,773	873,374
Balance (Outstanding Shares), Ending	10,312,625	10,221,006	10,242,405