Fair Value Disclosures Fair Value Disclosure (Tables)

12 Months Ended

Dec. 31, 2017

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block]

The following table presents an estimated fair value of the Company's senior notes and unsecured revolving credit facility. The estimated value of the senior notes is based on Level 2 inputs, which primarily reflect estimated prices for our Notes obtained from outside pricing sources. The Company determined that the fair value estimate of its unsecured revolving credit facility is classified as Level 3 within the fair value hierarchy, and the fair value of the outstanding revolving credit facility balance at December 31, 2016 approximated the carrying value due to the short-term nature of LIBOR contracts.

	December 31, 2017				December 31, 2016
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
	(dollars in thousands)
7.25% Senior Notes due 2022, net (1)	$	318,656	$	336,375	$	—	$	—
Unsecured revolving credit facility	$	—	$	—	$	118,000	$	118,000

(1) The carrying value for the Senior Notes, as presented, is net of the unamortized discount of $2.2 million, unamortized premium of $1.8 million, and $5.9 million of debt issuance costs. The unamortized discount, unamortized premium and debt issuance costs are not factored into the estimated fair value.