(5) Debt Commitments and Contingencies Credit Facility, Note Payable, and Commitments Debt obligations and undrawn letters of credit outstanding at the end of each period were as follows: June 30, 2016 December 31, 2015 Outstanding loans under unsecured revolving credit facility $ 415,000 350,000 Note payable 15,000 15,000 Total debt 430,000 365,000 Less: Current portion of debt (67,610 ) (62,050 ) Long-term debt $ 362,390 302,950 Undrawn letters of credit under unsecured revolving credit facility - face amount $ 36,267 36,266 Unsecured Revolving Credit Facility We have a $700,000 unsecured revolving credit facility ('Credit Facility'). The Credit Facility includes a committed letter of credit subfacility of $55,000 . The commitments under the Credit Facility will expire (and any borrowings outstanding under the Credit Facility will become due and payable) on March 1, 2018 . In the next twelve months, we have the ability and intent to repay a portion of the outstanding line of credit obligations using cash; therefore, we have classified this portion of the line of credit as a current liability. The Credit Facility contains certain financial and other covenants, and our right to borrow under the Credit Facility is conditioned upon, among other things, our compliance with these covenants. We are currently in compliance with these covenants. Borrowings under the Credit Facility generally bear interest at a rate per annum equal to the London Interbank Offered Rate (' LIBOR ') for interest periods of various lengths selected by us, plus 0.95% . A change in LIBOR impacts the interest rate on our borrowings, which in turn impacts interest expense incurred and cash flows. Based on the interest periods we have chosen, our weighted per annum interest rate at June 30, 2016 was approximately 1.4% . We pay a commitment fee for the unused portion of the Credit Facility. This fee is either 0.10% or 0.125% per annum based on our usage of the Credit Facility. Note Payable On December 7, 2015, we signed an agreement to acquire, ef