Fair Value (Tables)

6 Months Ended

Jun. 30, 2016

Fair Value Disclosures [Abstract]

Financial Assets and Liabilities Measured and Reported at Fair Value on a Recurring Basis

The following table presents the fair values of our money market demand accounts and investment grade fixed income securities as of the dates specified below:

	Level 1
Dollars in thousands	June 30, 2016		December 31, 2015
Money market demand accounts and investment grade fixed income securities	$	5,056	$	2,743

Fair Value of the 2019 Notes and 2021 Notes

The following table presents the approximate fair values of the 2019 Notes and 2021 Notes as of the dates specified below:

	Level 2
Dollars in thousands	June 30, 2016		December 31, 2015
2019 Notes	$	293,000	$	312,000
2021 Notes	$	194,000	$	213,000