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Stock-Based Compensation - Partnership Long Term Incentive Plan - Narratives (Details) - Partnership Phantom Units	12 Months Ended
	Dec. 31, 2018 $ / shares shares
First anniversary vesting
Stock-Based Compensation
Vesting percentage	33.33%
Second anniversary vesting
Stock-Based Compensation
Vesting percentage	33.33%
Third anniversary vesting
Stock-Based Compensation
Vesting percentage	33.33%
Vesting period	3 years
Partnership Long Term Incentive Plan
Stock-Based Compensation
Vested (in shares) | shares	53,091
Vested (usd per share) | $ / shares	$ 11.24

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