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Long-term Debt (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2014
USD ($)
Jan. 07, 2016
USD ($)
Dec. 31, 2015
USD ($)
Line of Credit Facility [Line Items]        
Line of credit facility $ 200,000     $ 125,000
Maximum borrowing capacity $ 250,000      
Percentage of subsidiary stock securing debt (in hundredths) 0.65      
Unused commitment fee on the average daily unused portion (in hundredths) 0.25%      
Average interest rate for the year 2.33%      
Letters of Credit Outstanding, Amount $ 1,000      
Long-term debt $ 104,400   $ 104,400 $ 0
Special dividend   $ 50,700    
Alternate base rates, applicable margins [Abstract]        
Applicable margin, federal funds rate (in hundredths) 0.50%      
Applicable margin, 30-day LIBOR (in hundredths) 2.00%      
LIBOR Borrowings [Member]        
Line of Credit Facility [Line Items]        
Description of basis for variable rate LIBOR      
Applicable margin on variable rate on borrowings, minimum (in hundredths) 2.00%      
Applicable margin on variable rate on borrowings, maximum (in hundredths) 2.75%      
Alternate Base Rate Borrowings [Member]        
Line of Credit Facility [Line Items]        
Description of basis for variable rate alternate base rate      
Applicable margin on variable rate on borrowings, minimum (in hundredths) 0.00%      
Applicable margin on variable rate on borrowings, maximum (in hundredths) 0.75%