Debt (Details) - Revolving Credit Facility	12 Months Ended
	Dec. 31, 2016 USD ($)	Sep. 20, 2016 USD ($)
Line of Credit Facility [Line Items]
Maximum borrowing capacity		$ 350,000,000
Maturity	5 years
Available increase in capacity	$ 350,000,000
Debt expense		1,900,000
Unamortized debt issuance costs		$ 1,800,000
Amount outstanding	0
Required EBITDA	$ 250,000,000
Commitment fee	0.20%
Required parent general partner ownership	51.00%
Dividend and distribution period from declaration date	60 days
Required interest coverage ratio	3.00
Pre-EBITDA Metric
Line of Credit Facility [Line Items]
Leverage ratio EBITDA metric	$ 135,000,000
Allowed leverage ratio	4.00
Allowed leverage ratio post-acquisition	4.50
Post-EBITDA Metric
Line of Credit Facility [Line Items]
Leverage ratio EBITDA metric	$ 135,000,000
Allowed leverage ratio	5.00
Allowed leverage ratio post-acquisition	5.50
Federal Funds Effective Swap Rate
Line of Credit Facility [Line Items]
Basis spread	0.50%
London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Basis spread	1.00%
Overnight Bank Funding Rate
Line of Credit Facility [Line Items]
Basis spread	0.50%
Letter of Credit
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 100,000,000