Commitments and Contingencies (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
	Oct. 02, 2012	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2018
Loss Contingencies [Line Items]
Non-cancelable revenue arrangements, future minimum revenues, 2018				$ 16,672
Non-cancelable revenue arrangements, future minimum revenues, 2019				19,199
Non-cancelable revenue arrangements, future minimum revenues, 2020				17,478
Non-cancelable revenue arrangements, future minimum revenues, 2021				15,589
Non-cancelable revenue arrangements, future minimum revenues, 2022				15,589
Non-cancelable revenue arrangements, future minimum revenues, subsequent years				$ 72,872
Martin Resource Management
Loss Contingencies [Line Items]
Quarterly purchase price reimbursement for non compliance	$ 750	$ 1,125
Maximum purchase price reimbursement for non compliance			$ 4,500