Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt (Details Textual)

v3.8.0.1
Long-Term Debt (Details Textual) - USD ($)
9 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Revolving line of credit $ 116,000,000 $ 140,000,000
PNC Bank, National Association, as Administrative Agent, and Lender Party [Member]    
Debt Instrument [Line Items]    
Interest expense recognized 2,982,000  
PNC Bank, National Association, as Administrative Agent, and Lender Party [Member] | Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Credit facilities, maximum capacity 300,000,000  
Revolving line of credit 116,000,000 140,000,000
Additional credit available subject to pro forma compliance with debt covenant $ 184,000,000 $ 160,000,000
Interest rate in effect 2.98%