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Credit Agreement (Tables)
 12 Months Ended
Dec. 31, 2014
Debt Disclosure [Abstract]  
Schedule of U.S. Credit Agreement

Selected details of our credit agreements as of and for the years ended December 31, 2014 and 2013 were as follows (dollars in thousands):

 

     As of December 31,  
     2014     2013  

Credit Agreement:

     

Credit facility remaining availability

    $ 98,437      $ 70,000   

Credit facility borrowings

    $ 10,000      $ —     

Outstanding letters of credit (1)(2)

    $ 11,563      $ 12,318   

Availability of additional letters of credit (3)

    $ 8,437      $ 7,682   

Weighted average daily revolving credit borrowings for the year ended

    $ 9      $ 40   

Weighted average annual interest rate

      1.67 %      5.25 % 

Commitment fee rate

      0.25 %      0.25 % 

Letter of credit fee rate

      0.75 %      0.75 % 

 

(1) Represents letters of credit which are fully collateralized with $11.6 million and $12.6 million of restricted cash as of December 31, 2014 and 2013, respectively.
(2) As of December 31, 2014, outstanding letters of credit not related to the Credit Agreement totaled $1.3 million, which amount is fully collateralized with restricted cash, which is in addition to the $11.6 million reflected above.
(3) The letters of credit sublimit of $20.0 million under the Credit Agreement is part of, not in addition to, the $120.0 million aggregate commitments.