Annual report pursuant to Section 13 and 15(d)

Debt and Credit Arrangements - Schedule of Long Term Debt (Details)

v3.6.0.2
Debt and Credit Arrangements - Schedule of Long Term Debt (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Revolving credit facility of $140 million, interest at LIBOR plus 1.75% $ 140,000 $ 0
Less: current portion of long-term debt 0 0
Total long-term debt 140,000 0
Revolving credit facility [Member] | Line of Credit [Member]    
Debt Instrument [Line Items]    
Revolving credit facility of $140 million, interest at LIBOR plus 1.75% 140,000 $ 0
Face amount of debt $ 140,000  
Revolving credit facility [Member] | Line of Credit [Member] | LIBOR [Member]    
Debt Instrument [Line Items]    
Interest at LIBOR (rate) 1.75%