Long-Term Investments (Tables)

6 Months Ended

Jun. 30, 2016

Investments, Debt and Equity Securities [Abstract]

Summary of Available-for-Sale Securities

The following is a summary of available-for-sale securities (in thousands):

			Gross		Gross		Estimated
			Unrealized		Unrealized		Fair
June 30, 2016	Cost		Gains		Losses		Value
Failed Auction Security	$	3,000	$	—	$	421	$	2,579
			Gross		Gross		Estimated
			Unrealized		Unrealized		Fair
December 31, 2015	Cost		Gains		Losses		Value
Failed Auction Security	$	3,000	$	—	$	474	$	2,526
Brokered certificates of deposit		340		—		—		340
	$	3,340	$	—	$	474	$	2,866

Amortized Cost and Estimated Fair Value of Failed Auction Securities by Contractual Maturities

The amortized cost and estimated fair value of the Failed Auction Security on June 30, 2016, by contractual maturity, is shown below (in thousands):

	Cost		Estimated Fair Value
Due in twenty to forty years	$	3,000	$	2,579

Rollforward of Credit (Gain) Loss Recognized in Earnings on Failed Auction Security

The following table represents a rollforward of the activity related to the credit loss recognized in earnings on the Failed Auction Security for the six months ended June 30 (in thousands):

	2016			2015
Balance at the beginning of the period	$	72		$	84
Reductions in the amount related to credit gain for which other-than- temporary impairment was not previously recognized		(7	)		(8	)
Balance at the end of the period	$	65		$	76