Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2015

Fair Value, Assets Measured on Recurring and Nonrecurring Basis

The following table provides a summary of financial assets that are measured at fair value on a recurring basis as of September 30, 2015 and December 31, 2014, aggregated by the level in the fair value hierarchy within which those measurements fall (in thousands):



	Fair Value Measurements
	Total		Level 1		Level 2		Level 3
September 30, 2015
Cash Equivalents - Money Market Funds	$	108,196	$	108,196	$	—	$	—
December 31, 2014
Cash Equivalents - Money Market Funds	$	123,141	$	123,141	$	—	$	—

Fair Value, Liabilities Measured on Recurring and Nonrecurring Basis

The carrying amounts and the estimated fair values of financial instruments as of September 30, 2015 and December 31, 2014, are as follows (in thousands):



	September 30, 2015				December 31, 2014
	Carrying Value		Estimated Fair Value		Carrying Value		Estimated Fair Value
2% Convertible Senior Notes	$	173,870	$	185,504	$	168,994	$	237,475