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Commitments and Contingencies (Tables)
9 Months Ended
Sep. 30, 2015
Commitments and Contingencies Disclosure [Abstract]  
Line of Credit Obligations and Undrawn Letters of Credit Outstanding
Line of credit obligations and undrawn letters of credit outstanding under the Credit Facility were as follows:
 
September 30,
2015
 
December 31,
2014
 
September 30,
2014
Line of credit, obligations outstanding
$
315,000

 
90,000

 
105,000

   Less: Line of credit, current
(41,510
)
 
(90,000
)
 
(105,000
)
Line of credit, noncurrent
$
273,490

 

 

 
 
 
 
 
 
Undrawn letters of credit - face amount
$
37,174

 
37,315

 
34,360