Investments: (Tables)

12 Months Ended

Dec. 31, 2015

Investments:

Summary of activities for available-for-sale securities

		(dollars in thousands)
		Gross Unrealized
2015		Cost		Gains		Losses			Fair Value
Equity	$	230,123	$	37,494	$	(9,635	)	$	257,982
Debt		189,700		1,158		(3,491	)		187,367
Other		5,255		–		(4	)		5,251
Total	$	425,078	$	38,652	$	(13,130	)	$	450,600
		(dollars in thousands)
		Gross Unrealized
2014		Cost		Gains		Losses			Fair Value
Equity	$	200,892	$	69,536	$	(2,163	)	$	268,265
Debt		168,182		9,981		(8,619	)		169,544
Other		13,927		–		(4	)		13,923
Total	$	383,001	$	79,517	$	(10,786	)	$	451,732

Schedule of contractual maturities of debt securities available-for-sale

		(dollars in thousands)
		2015				2014
		Cost		Fair Value		Cost		Fair Value
Due within one year	$	8,559	$	8,612	$	1,744	$	1,790
Due after one year through five years		50,018		49,538		48,105		47,508
Due after five years through ten years		56,448		55,880		67,103		67,665
Due after ten years		74,675		73,337		51,230		52,581
Total	$	189,700	$	187,367	$	168,182	$	169,544

Summary of realized gains and losses and proceeds from sales of securities

		(dollars in thousands)
		2015			2014			2013
Gross realized gains	$	53,453		$	64,437		$	46,647
Gross realized losses		(18,989	)		(46,258	)		(21,685	)
Proceeds from sales		640,217			438,941			605,364

Schedule of investments in associated companies

		(dollars in thousands)
		2015		2014
National Rural Utilities Cooperative Finance Corporation (CFC)	$	24,040	$	24,030
CT Parts, LLC		11,067		9,939
Georgia Transmission Corporation		25,872		24,254
Georgia System Operations Corporation		7,200		5,200
Other		3,831		3,945
Total	$	72,010	$	67,368