Long-term debt: (Tables)

6 Months Ended

Jun. 30, 2015

Long-term debt:

Schedule of interest expense recognized and the effective interest rates for the Convertible Notes

The amount of interest expense recognized and effective interest rates for the Convertible Notes were as follows (in thousands):

	Three Months Ended June 30, 2014			Six Months Ended June 30, 2014
Contractual coupon interest	$	189		$	419
Amortization of discount and costs on Notes	1,417			3,106
Interest expense	$	1,606		$	3,525
Effective interest rate	8.7		%	8.7		%