Significant Accounting Policies (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Less: Allowance for doubtful accounts	$ 2,100,000	$ 0
Capitalized interest	6,686,000	6,033,000	$ 1,444,000
Impairment of long-lived assets	$ 0	$ 0	$ 0
Number of units authorized (in shares)	2,600,000
Common stock distributed (in shares)	26,938,339	27,928,245	27,968,188
Preferred stock authorized (in shares)	500,000
Preferred stock issued (in shares)	0
Preferred stock outstanding (in shares)	0
Common Units | Stock Compensation Plan
Property, Plant and Equipment [Line Items]
Number of units authorized (in shares)	2,300,000