Equity - Schedule of Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator for basic and diluted earnings (loss) per share attributable to common stockholders:
Net income (loss) attributable to common stockholders	$ 3,272	$ (3,111)	$ (5,292)	$ 17,422
Denominator:
Denominator for basic earnings per share—weighted average number of shares (in shares)	15,913,975	15,635,953	15,900,362	14,768,429
Effect of diluted securities (in shares)	200,000	0	0	200,000
Denominator for diluted earnings per share—adjusted weighted average number of shares and assumed conversions (in shares)	16,113,975	15,635,953	15,900,362	14,968,429
Basic earnings (loss) per share (in dollars per share)	$ 0.21	$ (0.20)	$ (0.33)	$ 1.18
Diluted earnings (loss) per share (in dollars per share)	$ 0.20	$ (0.20)	$ (0.33)	$ 1.16