Organization and Operations (Details)	6 Months Ended
	Jun. 30, 2019 $ / shares shares	Dec. 31, 2018 $ / shares shares
Organization and Operations [Line Items]
Number of reportable segments	2
Preferred stock, shares authorized (in shares)	9,333,333
Common Class A [Member]
Organization and Operations [Line Items]
Common stock, shares authorized (in shares)	140,000,000	140,000,000
Common stock, par value (in dollars per share) | $ / shares	$ 0.01	$ 0.01
Common Class B [Member]
Organization and Operations [Line Items]
Common stock, shares authorized (in shares)	35,000,000	35,000,000
Common stock, par value (in dollars per share) | $ / shares	$ 0.01	$ 0.01