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Income taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current-
Federal	$ 5,679	$ 2,207	$ 9,474
State and Puerto Rico	1,151	1,673	1,954
Total	6,830	3,880	11,428
Deferred-
Federal	2,897	(10,121)	1,501
State and Puerto Rico	318	778	(1,736)
Total	3,215	(9,343)	(235)
Provision for income taxes	$ 10,045	$ (5,463)	$ 11,193

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