Long-term Debt (Tables)

12 Months Ended

Dec. 31, 2014

Long-term Debt [Abstract]

Interest Expense of Long-term Debt

	For the year ended
	December 31, 2014
Interest expense at an annual rate of 2.50%	$	15,981
Interest expense at an annual rate of 0.50%	$	1,042
Interest expense at an annual rate of 1.75%	$	3,614
Amortization of debt issuance costs	$	3,373
Total interest expense	$	24,010

	December 31, 2013
Interest expense at an annual rate of 2.50%	$	4,808
Amortization of debt issuance costs	$	743
Total interest expense	$	5,551