Earnings per Share (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator [Abstract]
Net income (loss) attributable to controlling interest	$ 3,010	$ 6,995	$ 40,662	$ (13,411)
Denominator [Abstract]
Denominator for basic earnings per share (in shares)	22,523	22,923	22,510	23,009
Effect of dilutive securities [Abstract]
Restricted stock units (in shares)	112	104	107	0
Supplemental Executive Retirement Plan (in shares)	49	57	49	0
Denominator for diluted earnings per share (in shares)	22,684	23,084	22,666	23,009