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Stock Repurchases (Details) - USD ($)
 2 Months Ended 12 Months Ended 14 Months Ended
Jan. 04, 2015
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2015
Equity, Class of Treasury Stock [Line Items]          
Total Number of Shares Purchased 82,100 680,813 82,100 680,813 762,913
Average Price Paid Per Share $ 34.57 $ 35.22     $ 35.22
Maximum Dollar Value of Shared That May Yet Be Purchased Under the Program     $ 73,000,000   $ 73,000,000
Publicly Announced Program [Member]          
Equity, Class of Treasury Stock [Line Items]          
Total Number of Shares Purchased 82,100 680,813     762,913
Maximum Dollar Value of Shared That May Yet Be Purchased Under the Program     $ 73,157,000   $ 73,157,000