CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME [Abstract]
Net income	$ 21,754	$ 17,587	$ 59,189	$ 35,497
Other comprehensive income, net of tax:
Foreign currency translation adjustments	(19)	698	(257)	1,742
Comprehensive income before preferred stock dividends	21,735	18,285	58,932	37,239
Dividends on preferred stock	(1,748)		(2,917)
Comprehensive income available to CAI common stockholders	$ 19,987	$ 18,285	$ 56,015	$ 37,239