Related Party Transactions - Summary of Related Party Balances - Consolidated Balance Sheets (Details) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Summary of Related Party Balances
Accounts receivable		$ 0	$ 36
Accounts payable		0	1,101
West Central
Summary of Related Party Balances
Accounts receivable	[1]	0	36
Accounts payable	[1]	$ 0	$ 1,101

[1] Represents balances with West Central.