Intangible Assets and Liabilities Goodwill - Intangibles (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Intangible assets
Intangible assets, Gross Amount	$ 925,123	$ 101,026
Finite-lived intangible assets, Accumulated Amortization	27,653	11,694
Finite-Lived Intangible Assets, Net	831,583
Intangible assets, Net Amount	897,470	89,332
Amortization expense related to the intangible assets	15,800	3,000
Trade names
Intangible assets
Indefinite-lived intangible assets, Amount	65,887	65,812
Customer relationships
Intangible assets
Finite-lived intangible assets, Gross Amount	859,101	35,081
Finite-lived intangible assets, Accumulated Amortization	27,543	11,629
Finite-Lived Intangible Assets, Net	831,558	$ 23,452
Non-compete agreements
Intangible assets
Amortization period		3 years
Finite-lived intangible assets, Gross Amount	135	$ 133
Finite-lived intangible assets, Accumulated Amortization	110	65
Finite-Lived Intangible Assets, Net	$ 25	$ 68
Minimum | Customer relationships
Intangible assets
Amortization period	7 years	7 years
Maximum | Customer relationships
Intangible assets
Amortization period	20 years	15 years