ACCUMULATED OTHER COMPREHENSIVE INCOME (Tables)

6 Months Ended

Jun. 30, 2018

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Schedule of beginning and ending balances of accumulated other comprehensive income

The following table reconciles, by component, the beginning and ending balances of accumulated other comprehensive income (loss), net of tax.

	Accumulated other comprehensive income (loss) by component
	Unrealized gains (losses) on available-for- sale securities			Unrecognized pension and postretirement benefit obligations
($ in thousands)				Net actuarial loss			Prior service credit			Total			Total
Balance at December 31, 2017	$	83,497		$	(13,074	)	$	12,961		$	(113	)	$	83,384
Cumulative adjustment for adoption of financial instruments recognition and measurement changes	(66,234		)	—			—			—			(66,234		)
Other comprehensive income (loss) before reclassifications	(26,546		)	—			—			—			(26,546		)
Amounts reclassified from accumulated other comprehensive income (loss)	4,530			166			(1,244		)	(1,078		)	3,452
Other comprehensive income (loss)	(22,016		)	166			(1,244		)	(1,078		)	(23,094		)
Balance at June 30, 2018	$	(4,753	)	$	(12,908	)	$	11,717		$	(1,191	)	$	(5,944	)

	Accumulated other comprehensive income (loss) by component
	Unrealized gains (losses) on available-for- sale securities			Unrecognized pension and postretirement benefit obligations
($ in thousands)				Net actuarial loss			Prior service credit			Total			Total
Balance at December 31, 2016	$	49,748		$	(16,299	)	$	12,632		$	(3,667	)	$	46,081
Other comprehensive income (loss) before reclassifications	17,979			—			—			—			17,979
Amounts reclassified from accumulated other comprehensive income (loss)	(4,135		)	479			(1,024		)	(545		)	(4,680		)
Other comprehensive income (loss)	13,844			479			(1,024		)	(545		)	13,299
Balance at June 30, 2017	$	63,592		$	(15,820	)	$	11,608		$	(4,212	)	$	59,380

Amounts reclassified out of accumulated other comprehensive income (loss)

The following tables display amounts reclassified out of accumulated other comprehensive income and into net income during the three and six months ended June 30, 2018 and 2017, respectively.

($ in thousands)	Amounts reclassified from accumulated other comprehensive income (loss)
Accumulated other comprehensive income (loss) components	Three months ended   June 30, 2018			Six months ended   June 30, 2018			Affected line item in the consolidated statements of income
Unrealized gains (losses) on investments:
Reclassification adjustment for net realized investment gains (losses) included in net income	$	(5,490	)	$	(5,734	)	Net realized investment gains (losses) and, beginning in 2018, change in unrealized investment gains on equity investments
Deferred income tax (expense) benefit	1,153			1,204			Total income tax expense (benefit)
Net reclassification adjustment	(4,337		)	(4,530		)	Net income (loss)
Unrecognized pension and postretirement benefit obligations:
Reclassification adjustment for amounts amortized into net periodic pension and postretirement benefit income:
Net actuarial loss	(107		)	(210		)	(1)
Prior service credit	787			1,575			(1)
Total before tax	680			1,365
Deferred income tax (expense) benefit	(143		)	(287		)
Net reclassification adjustment	537			1,078
Total reclassification adjustment	$	(3,800	)	$	(3,452	)

(1) These reclassified components of accumulated other comprehensive income are included in the computation of net periodic pension and postretirement benefit income (see note 7, Employee Retirement Plans, for additional details).

($ in thousands)	Amounts reclassified from accumulated other comprehensive income (loss)
Accumulated other comprehensive income (loss) components	Three months ended June 30, 2017			Six months ended June 30, 2017			Affected line item in the consolidated statements of income
Unrealized gains (losses) on investments:
Reclassification adjustment for net realized investment gains (losses) included in net income	$	4,702		$	6,362		Net realized investment gains (losses) and, beginning in 2018, change in unrealized investment gains on equity investments
Deferred income tax (expense) benefit	(1,646		)	(2,227		)	Total income tax expense (benefit)
Net reclassification adjustment	3,056			4,135			Net income (loss)
Unrecognized pension and postretirement benefit obligations:
Reclassification adjustment for amounts amortized into net periodic pension and postretirement benefit income:
Net actuarial loss	(369		)	(737		)	(1)
Prior service credit	788			1,575			(1)
Total before tax	419			838
Deferred income tax (expense) benefit	(146		)	(293		)
Net reclassification adjustment	273			545
Total reclassification adjustment	$	3,329		$	4,680

(1) These reclassified components of accumulated other comprehensive income are included in the computation of net periodic pension and postretirement benefit income (see note 7, Employee Retirement Plans, for additional details).