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Short-Term Debt (Narrative) (Details)
Aug. 31, 2015
USD ($)
Jul. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2015
Jul. 28, 2015
Jul. 27, 2015
Jun. 30, 2015
Mar. 31, 2015
Jan. 31, 2015
Dec. 31, 2014
USD ($)
Sep. 30, 2014
Jun. 30, 2014
Line of Credit Facility [Line Items]                        
Amount borrowed under revolving credit facility     $ 2,500,000             $ 0    
Debt to EBITDA ratio (greater than)     3.5                  
Ratio of net indebtedness to EBITDA     4.40 4.56     4.61 4.62   4.65 4.59 4.38
Short-term loans     $ 0             $ 32,000,000    
Bank Of America, N.A. [Member]                        
Line of Credit Facility [Line Items]                        
Amount of revolving credit facility   $ 50,000,000                    
Ratio of net indebtedness to EBITDA   3.5     3.0 2.5           2.73
Citibank [Member]                        
Line of Credit Facility [Line Items]                        
Short-term loans                   $ 32,000,000    
Weighted average interest rate (as a percent)                 2.34%      
LIBOR [Member] | Bank Of America, N.A. [Member]                        
Line of Credit Facility [Line Items]                        
Debt instrument, basis spread on variable rate (as a percent)   2.75%                    
Revolving Credit Facility [Member]                        
Line of Credit Facility [Line Items]                        
Amount borrowed under revolving credit facility     $ 2,500,000                  
Revolving Credit Facility [Member] | JPMorgan Chase Bank N.A. [Member]                        
Line of Credit Facility [Line Items]                        
Line of credit facility, maximum borrowing amount $ 25,000,000                      
Revolving Credit Facility [Member] | LIBOR [Member] | JPMorgan Chase Bank N.A. [Member]                        
Line of Credit Facility [Line Items]                        
Debt instrument, basis spread on variable rate (as a percent) 2.25%                      
Line of Credit [Member] | Revolving Credit Facility [Member]                        
Line of Credit Facility [Line Items]                        
Ratio of net indebtedness to EBITDA     2.58