Fair Value Measurements - Measured on Nonrecurring Basis (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) Y $ / hp	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Valuation of our interest rate swaps and impaired assets
Goodwill impairment	$ 99,800	$ 0	$ 99,830	$ 0
Level 3 | Impaired Long-Lived Assets | Land and buildings | Measurement Input, Sales trends period
Valuation of our interest rate swaps and impaired assets
Measurement input | Y			3
Level 3 | Impaired Long-Lived Assets | Land and buildings | Measurement Input, Sale proceeds | Minimum
Valuation of our interest rate swaps and impaired assets
Measurement input			100
Level 3 | Impaired Long-Lived Assets | Land and buildings | Measurement Input, Sale proceeds | Maximum
Valuation of our interest rate swaps and impaired assets
Measurement input			600
Level 3 | Impaired Long-Lived Assets | Land and buildings | Measurement Input, Sale proceeds | Weighted average
Valuation of our interest rate swaps and impaired assets
Measurement input			427
Level 3 | Impaired Long-Lived Assets | Compressors | Measurement Input, Weighted average disposal period
Valuation of our interest rate swaps and impaired assets
Measurement input | Y			4
Level 3 | Impaired Long-Lived Assets | Compressors | Measurement Input, Sale proceeds | Minimum
Valuation of our interest rate swaps and impaired assets
Measurement input | $ / hp			0
Level 3 | Impaired Long-Lived Assets | Compressors | Measurement Input, Sale proceeds | Maximum
Valuation of our interest rate swaps and impaired assets
Measurement input | $ / hp			372
Level 3 | Impaired Long-Lived Assets | Compressors | Measurement Input, Sale proceeds | Weighted average
Valuation of our interest rate swaps and impaired assets
Measurement input | $ / hp			21
Level 3 | Impaired Long-Lived Assets | Compressors | Measurement Input, Discount for market liquidity
Valuation of our interest rate swaps and impaired assets
Measurement input			0.78
Nonrecurring Basis | Level 3 | Impaired Long-Lived Assets | Land and buildings
Valuation of our interest rate swaps and impaired assets
Impaired assets			$ 430
Nonrecurring Basis | Level 3 | Impaired Long-Lived Assets | Compressors
Valuation of our interest rate swaps and impaired assets
Impaired assets			$ 2,561		$ 5,859