Consolidated Statement of Stockholders' Equity - 3 months ended Mar. 31, 2017 - USD ($) shares in Thousands, $ in Thousands		Total		Common Stock		Additional Paid-in Capital	Treasury Stock		Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2016		$ 1,178,188	[1]	$ 3,612		$ 373,983	$ (155,801)		$ 947,519	$ 8,875
Beginning balance (in shares) at Dec. 31, 2016		36,147		36,147	[2]		7,023	[2]
Net income		$ 21,110							21,110
Dividends declared		(1,324)							(1,324)
Changes in comprehensive income:
Change in net unrealized gain on investments		14,645								14,645
Change in net non-credit other-than-temporary impairment losses		422								422
Change in foreign currency translation loss		(266)								(266)
Total comprehensive income		14,801								14,801
Shares issued	[3]	(11,106)		$ 33		(11,139)
Shares issued (in shares)	[2],[3]			337
Share-based compensation		4,467				4,467
Ending balance at Mar. 31, 2017		$ 1,206,136	[1]	$ 3,645		$ 367,311	$ (155,801)		$ 967,305	$ 23,676
Ending balance (in shares) at Mar. 31, 2017		36,484		36,484	[2]		7,023	[2]

[1] We completed a two-for-one stock split on January 20, 2017. All share and per share data prior to January 20, 2017 has been retroactively restated on a post-split basis.

[2] We completed a two-for-one stock split on January 20, 2017. All share data prior to January 20, 2017 has been retroactively restated on a post-split basis.

[3] Includes shares issued under the Second Amended and Restated 2005 Stock Incentive Plan to Directors and the Employee Stock Purchase Plan.