Short-Term and Long-Term Borrowings (Detail Textuals 1) $ in Thousands	Feb. 05, 2016 USD ($)	Sep. 30, 2016 USD ($)
Debt Instrument [Line Items]
Aggregate commitment of loan		$ 320,000
Term Loan Agreement | JPMorgan
Debt Instrument [Line Items]
Aggregate commitment of loan	$ 50,000
Minimum increments tranches of term loans	10,000
Maximum amount of debt outstanding	100,000
Borrowed amount	$ 50,000
Interest rate base	LIBOR plus 0.90%
Term Loan Agreement | JPMorgan | LIBOR
Debt Instrument [Line Items]
Line of credit facility, description of variable rate basis	LIBOR
Basis spread on variable rate	0.90%
Term Loan Agreement | JPMorgan | Prime Rate
Debt Instrument [Line Items]
Line of credit facility, description of variable rate basis	Prime Rate
Term Loan Agreement | JPMorgan | Federal Reserve Bank of New York Rate
Debt Instrument [Line Items]
Line of credit facility, description of variable rate basis	Federal Reserve Bank of New York Rate
Basis spread on variable rate	0.50%
Term Loan Agreement | JPMorgan | Statutory Reserve Rate
Debt Instrument [Line Items]
Line of credit facility, description of variable rate basis	LIBOR multiplied by the Statutory Reserve Rate
Basis spread on variable rate	1.00%
Term Loan Agreement | Minimum | JPMorgan
Debt Instrument [Line Items]
Debt to total capitalization ratio	0.60
Interest and dividend coverage ratio	1.00
Term Loan Agreement | Maximum | JPMorgan
Debt Instrument [Line Items]
Debt to total capitalization ratio	1.00
Interest and dividend coverage ratio	1.50