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Revolving Credit Facility (Tables)
 12 Months Ended
Dec. 31, 2014
Debt Disclosure [Abstract]  
Available Credit on the Credit Facility
The following table summarizes the available credit on the Credit Facility:
 
December 31, 2014
December 31, 2013
 
(in thousands)
Maximum borrowings
$
500,000

$
500,000

Less outstanding balances:
 
 
Borrowings
—

—

Letters of credit
85,768

59,760

Surety bonds
—

—

Available credit
$
414,232

$
440,240