Shareholders' Equity (Details) - USD ($) $ in Thousands	3 Months Ended	36 Months Ended
	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015
Shareholders' Equity [Abstract]
Treasury Stock Value	$ 31,676		$ 18,926
Stock Repurchase Program Authorized Percent Of Common Stock		5.00%
Stock Repurchase Program, Number of Shares Authorized to be Repurchased		970,000
Treasury Stock, Shares, Acquired	803,546	1,925,104
Treasury Stock, Amount, Acquired	$ 12,700	$ 31,400