Investment Securities (Details 2) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Unrealized Gains (Losses) on Available-For-Sale Securities
Amortized Cost	$ 262,891	$ 512,109
Unrealized Gains	25,632	13,408
Unrealized Losses	(64)	(2,762)
Estimated Fair Value	288,459	522,755
Corporate bonds
Unrealized Gains (Losses) on Available-For-Sale Securities
Amortized Cost	146,899	402,472
Unrealized Gains	64	285
Unrealized Losses	(31)	(87)
Estimated Fair Value	146,932	402,670
Other (including restricted)
Unrealized Gains (Losses) on Available-For-Sale Securities
Amortized Cost	14,185	32,488
Unrealized Gains	3	3
Unrealized Losses	(33)	(23)
Estimated Fair Value	14,155	32,468
Equity securities - strategic
Unrealized Gains (Losses) on Available-For-Sale Securities
Amortized Cost	101,807	77,149
Unrealized Gains	25,565	13,120
Unrealized Losses	0	(2,652)
Estimated Fair Value	$ 127,372	$ 87,617

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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