Common Stock Repurchase Plan (Narrative) (Details) - USD ($)		3 Months Ended	9 Months Ended
	Jul. 29, 2016	Sep. 30, 2016	Sep. 30, 2016
Equity Class Of Treasury Stock [Line Items]
Shares repurchase program, repurchased cost			$ 7,800,000
Common Stock [Member]
Equity Class Of Treasury Stock [Line Items]
Shares repurchase program, expiration date	Jul. 31, 2018
Shares repurchase program, shares repurchased		187,331	187,331
Shares repurchase program, repurchased cost		$ 7,800,000
Shares repurchase program, average price per share		$ 41.78
Maximum [Member] | Common Stock [Member]
Equity Class Of Treasury Stock [Line Items]
Shares repurchase program, authorized amount	$ 150,000,000