Related Party Transactions (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	[1]	Dec. 31, 2014
Related Party Transaction [Line Items]
Payments for repurchase of common stock	$ 9,176	$ 12,997		$ 31,395	[1]
Chairman of The Board of Directors [Member]
Related Party Transaction [Line Items]
Shares of common stock cancelled				400,000
Payments for repurchase of common stock				$ 8,800
Average price per share				$ 21.92
CAIJ [Member]
Related Party Transaction [Line Items]
Ownership percentage by parent	80.00%
Ownership percentage by noncontrolling interest	20.00%

[1] Amounts for the years ended December 31, 2015 and 2014 have been restated for immaterial corrections of identified errors relating to prepaid loan fees (see Note 2 (b) "Correction of Immaterial Errors").