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Short-Term Debt (Narrative) (Details)
Nov. 10, 2016
USD ($)
Dec. 31, 2016
Sep. 30, 2016
Aug. 01, 2016
USD ($)
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Line of Credit Facility [Line Items]                          
Debt to EBITDA ratio (greater than)   3.0                      
Ratio of net indebtedness to EBITDA, debt covenant   4.20 4.08   4.40 4.80 4.40 4.56 4.61 4.62 4.65 4.59 4.38
Revolving Credit Facility [Member] | Bank Of America, N.A. [Member]                          
Line of Credit Facility [Line Items]                          
Line of credit facility, maximum borrowing amount       $ 25,000,000                  
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) 2.50%                        
Line of Credit [Member] | Revolving Credit Facility [Member]                          
Line of Credit Facility [Line Items]                          
Ratio of net indebtedness to EBITDA, debt covenant   1.64