Unit Based Awards - Restricted Unit Activity (Details) - Restricted Units $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($) $ / shares shares
Number of Units
Non-vested, beginning of period, number of units (in shares) | shares	103,800
Granted, number of units (in shares) | shares	12,000
Vested, number of units (in shares) | shares	(7,300)
Forfeited, number of units (in shares) | shares	(5,750)
Non-vested, end of period, number of units (in shares) | shares	102,750
Weighted Average Grant-Date Fair Value Per Unit
Non-vested, beginning of period, weighted average grant-date fair value per unit (USD per share) | $ / shares	$ 26.54
Granted, weighted average grant-date fair value per unit (USD per share) | $ / shares	19.00
Vested, weighted average grant-date fair value per unit (USD per share) | $ / shares	19.90
Forfeited, weighted average grant-date fair value per unit (USD per share) | $ / shares	28.50
Non-vested, end of period, weighted average grant-date fair value per unit (USD per share) | $ / shares	$ 25.24
Aggregate intrinsic value, end of period | $	$ 1,598