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Debt (Line of Credit) (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Aug. 12, 2014
Line of Credit Facility [Line Items]      
Revolving line of credit borrowings $ 30,000,000 $ 0  
Line of Credit Facility, Interest Rate at Period End 1.79%    
Amount Available to Increase Borrowing Capacity     $ 250,000,000
Remaining Borrowing Capacity $ 218,600,000    
Line of Credit [Member]      
Line of Credit Facility [Line Items]      
Maximum Borrowing Capacity     250,000,000
Additional Applicable Rate Added to Base Rate, Minimum 1.50%    
Additional Applicable Rate Added to Base Rate, At End of Period 0.50%    
Unused Capacity, Commitment Fee Percentage 0.25%    
Letter of Credit [Member]      
Line of Credit Facility [Line Items]      
Maximum Borrowing Capacity     40,000,000
Line of Credit Facility, Amount Outstanding $ 1,400,000    
Swing Line Loan [Member]      
Line of Credit Facility [Line Items]      
Maximum Borrowing Capacity     $ 25,000,000
London Interbank Offered Rate (LIBOR) [Member]      
Line of Credit Facility [Line Items]      
Debt Instrument, Basis Spread on Variable Rate 1.00%    
Minimum [Member] | Eurodollar [Member]      
Line of Credit Facility [Line Items]      
Debt Instrument, Basis Spread on Variable Rate 0.875%    
Minimum [Member] | Base Rate [Member]      
Line of Credit Facility [Line Items]      
Debt Instrument, Basis Spread on Variable Rate 0.00%    
Maximum [Member] | Eurodollar [Member]      
Line of Credit Facility [Line Items]      
Debt Instrument, Basis Spread on Variable Rate 1.70%    
Maximum [Member] | Base Rate [Member]      
Line of Credit Facility [Line Items]      
Debt Instrument, Basis Spread on Variable Rate 0.70%