Exit Activities (Tables)

6 Months Ended

Jun. 30, 2016

Restructuring and Related Activities [Abstract]

Summary of Restructuring Related Obligations

The following table reconciles the firm transportation obligation as of the dates presented:

	As of
	June 30,			December 31,
	2016			2015
Balance at beginning of period	$	13,461		$	14,790
Accretion	317			942
Cash payments, net	(1,059		)	(2,271		)
Balance at end of period	$	12,719		$	13,461