Derivative Instruments (Tables)

12 Months Ended

Dec. 31, 2016

Summarized Information of Location and Gross Amount of Derivatives' Fair Value in Consolidated Balance Sheets

The following table summarizes information on the location and the gross amount of the derivatives’ fair value on the consolidated balance sheets as of December 31, 2016 and 2015:

(Dollars in thousands) Derivatives Not Designated as Hedging Instruments under ASC 815	Balance Sheet Location	December 31, 2016					December 31, 2015
		Notional Amount		Fair Value			Notional Amount		Fair Value
Interest rate swap agreements	Other liabilities	$	200,000	$	(11,524	)	$	200,000	$	(15,256	)

Summary of Net Gains (Losses) Included in Consolidated Statements of Operations for Changes in Fair Value of Derivatives and Periodic Net Interest Settlements Under Derivatives

The following table summarizes the net gains (losses) included in the consolidated statements of operations for changes in the fair value of the derivatives and the periodic net interest settlements under the derivatives for the years ended December 31, 2016, 2015, and 2014:

(Dollars in thousands)	Consolidated Statements of Operations Line	Years Ended December 31,
		2016			2015			2014
Interest rate swap agreements	Net realized investment gains (losses)	$	(1,110	)	$	(6,988	)	$	(20,836	)