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Revolving Credit Facility (Tables)
 6 Months Ended
Jun. 30, 2015
Debt Disclosure [Abstract]  
Available credit on the Credit Facility
The following table summarizes available credit on the Credit Facility:
 
June 30, 2015
December 31, 2014
 
(in thousands)
Maximum borrowings
$
500,000

$
500,000

Less outstanding balances:
 
 
Borrowings
—

—

Letters of credit
75,322

85,768

Surety bonds
—

—

Available credit
$
424,678

$
414,232