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Revolving Credit Facility (Tables)
 6 Months Ended
Jun. 30, 2014
Debt Disclosure [Abstract]  
Available credit on the revolving credit facility
The following table summarizes available credit on the Credit Facility:
 
June 30, 2014
December 31, 2013
 
(in thousands)
Maximum borrowings
$
500,000

$
500,000

Less outstanding balances:
 
 
Borrowings
308,000

—

Letters of credit
48,930

59,760

Surety bonds
—

—

Available credit
$
143,070

$
440,240