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

$
500,000

Less outstanding balances:
 
 
Borrowings
59,950

—

Letters of credit
76,008

85,768

Surety bonds
—

—

Available credit
$
364,042

$
414,232