Commitments and Contingencies (Tables)

6 Months Ended

Jun. 30, 2015

Commitments and Contingencies Disclosure [Abstract]

Line of Credit Obligations and Undrawn Letters of Credit Outstanding

Line of credit obligations and undrawn letters of credit outstanding under the Credit Facility were as follows:

	June 30, 2015			December 31, 2014		June 30, 2014
Line of credit, obligations outstanding	$	330,000		90,000		70,000
Less: Line of credit, current	(79,575		)	(90,000	)	(70,000	)
Line of credit, noncurrent	$	250,425		—		—
Undrawn letters of credit - face amount	$	37,256		37,315		34,411