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Debt, Line of Credit (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Credit Facilities [Line Items]    
Line of credit $ 210,000 $ 310,000
Line of Credit [Member]    
Credit Facilities [Line Items]    
Credit facility, maximum borrowing capacity $ 500,000  
Maturity date Jan. 03, 2020  
Description of applicable margin calculation based on utilization percentage Amounts drawn under the facility bear interest at 90-day LIBOR plus an applicable margin from a range of 2.50% to 3.50%. The applicable margin varies based on the percentage of the total commitment drawn, with a 2.50% margin at utilization equal to or lower than 35%, a 3.25% margin at utilization greater than 35% but less than or equal to 50%, and a 3.50% margin at utilization greater than 50%.  
Quarterly commitment fee 0.50%  
Letters of Credit Outstanding, Amount $ 24,200  
Line of credit 210,000  
Swingline Line of Credit [Member]    
Credit Facilities [Line Items]    
Credit facility, maximum borrowing capacity 50,000  
Secured and Unsecured Letter of Credit Facilities    
Credit Facilities [Line Items]    
Credit facility, maximum borrowing capacity 64,500  
Letters of Credit Outstanding, Amount 62,500  
Option to increase maximum borrowing capacity [Member]    
Credit Facilities [Line Items]    
Credit facility, maximum borrowing capacity 250,000  
Term Loan [Member]    
Credit Facilities [Line Items]    
Credit facility, maximum borrowing capacity 100,000  
Revolving Credit Facility [Member]    
Credit Facilities [Line Items]    
Credit facility, maximum borrowing capacity 400,000  
Letter of credit sublimit [Member]    
Credit Facilities [Line Items]    
Credit facility, maximum borrowing capacity $ 50,000