Fair Value of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2017

Schedule of assets and liabilities measured at fair vale on a recurring basis

All assets measured at fair value are categorized in the table below based upon the lowest level of significant input to the valuations. All fair value measurements at the reporting date were on a recurring basis.



June 30, 2017 (In thousands)	Quoted Prices in Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Recurring fair value measurements
Financial Assets:
U.S. Treasury securities	$	202,364	$	—	$	—	$	202,364
U.S. agency securities	—		26,357		—		26,357
U.S. agency mortgage-backed securities	—		397,602		—		397,602
Municipal debt securities	—		370,068		—		370,068
Corporate debt securities	—		555,965		—		555,965
Residential and commercial mortgage securities	—		69,672		—		69,672
Asset-backed securities	—		135,505		—		135,505
Money market funds	83,508		—		—		83,508
Total assets at fair value	$	285,872	$	1,555,169	$	—	$	1,841,041



December 31, 2016 (In thousands)	Quoted Prices in Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Recurring fair value measurements
Financial Assets:
U.S. Treasury securities	$	191,548	$	—	$	—	$	191,548
U.S. agency securities	—		18,441		—		18,441
U.S. agency mortgage-backed securities	—		316,494		—		316,494
Municipal debt securities	—		334,324		—		334,324
Corporate debt securities	—		456,357		—		456,357
Residential and commercial mortgage securities	—		68,336		—		68,336
Asset-backed securities	—		127,172		—		127,172
Money market funds	102,430		—		—		102,430
Total assets at fair value	$	293,978	$	1,321,124	$	—	$	1,615,102

Schedule of changes during period in Level 3 liabilities measured at fair value on a recurring basis, and realized and unrealized losses related to Level 3 liabilities

The following table presents changes during the three and six months ended June 30, 2016 in Level 3 liabilities measured at fair value on a recurring basis, and the net realized and unrealized losses related to the Level 3 liabilities in the condensed consolidated balance sheets at June 30, 2016. During the six months ended June 30, 2017, and in the year ended December 31, 2016, we had no Level 3 assets.



	Three Months Ended June 30,		Six Months Ended June 30,
(In thousands)	2016		2016
Level 3 Liabilities
Fair value of derivative liabilities at beginning of period	$	898	$	1,232
Net realized and unrealized losses included in income	755		78
Other comprehensive (income) loss	—		—
Purchases, sales, issues and settlements, net	359		702
Gross transfers in	—		—
Gross transfers out	—		—
Fair value of derivative liabilities at end of period	$	2,012	$	2,012

Changes in net unrealized losses included in income on instruments held at end of period	$	755	$	78