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LEASES - Additional Disclosures (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 property Capital_lease Operating_lease	Dec. 31, 2013	Dec. 31, 2012
Operating Leased Assets [Line Items]
Number of non-cancelable operating leases (in number of leases)	40
Operating leases, rent expense	$ 4,048us-gaap_LeaseAndRentalExpense	$ 2,818us-gaap_LeaseAndRentalExpense	$ 2,490us-gaap_LeaseAndRentalExpense
Number of properties leased from related parties (in number of leases)	2
Number of capital leases	2crfn_NumberofLeases
Capital lease obligations, noncurrent	5,972	3,051
Related Party
Operating Leased Assets [Line Items]
Operating leases, rent expense	$ 760	$ 755	$ 729

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid more than one year (or one operating cycle, if longer) after the balance sheet date.

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