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Share-Based Compensation Market Measure-based RSU Grant (Details) (Market Measure-Based Restricted Stock Units (RSUs) [Member], USD $)
9 Months Ended 0 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2012
Mar. 30, 2012
Chief Executive Officer [Member]
Sep. 30, 2013
Chief Executive Officer [Member]
Sep. 30, 2013
Weighted Average Grant Date Fair Value Per Share [Member]
Sep. 30, 2013
Vested Restricted Stock Units R S U [Member]
Dec. 31, 2012
Vested Restricted Stock Units R S U [Member]
Sep. 30, 2013
Restricted Stock Units (RSUs) [Member]
Dec. 31, 2012
Restricted Stock Units (RSUs) [Member]
Sep. 30, 2013
Nonvested Restricted Stock Units R S U [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Share Based Compensation Arrangement By Share Based Payment Award, Equity Instruments Other Than Options, Vested, Number         14,748 14,748      
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number             174,108 103,239  
Expected Volatility Rate     27.00%            
Risk Free Interest Rate     0.90%            
Expected Dividend Rate     3.60%            
Expected Term     6 years            
Outstanding, Jan. 01, 2013                 88,491
Granted 103,239 103,239     0   9,542   9,542
Vested 0       0   0   0
Settled         0   0   0
Issuance of dividend equivalents         0   0   0
Modified from time based         0 [1]   61,327 [1]   61,327 [1]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period         0   0    
Outstanding, Sept. 30, 2013                 159,360
Oustanding, Jan. 01, 2013       $ 41.20          
Granted $ 41.20   $ 44.55 $ 44.55          
Vested $ 0     $ 0          
Modified from time based       $ 53.05 [1]          
Oustanding, Sept. 30, 2013       $ 45.96          
[1] On April 4, 2013 the terms of time-based RSU’s granted to certain officers of the Company in January were modified to include market-measure and performance-based vesting requirements.