Fair Value Measurement (Tables)

9 Months Ended

Sep. 30, 2016

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

The following tables summarize our cash equivalents by significant investment categories (in thousands):



	Fair Value Measurement at Reporting Date Using
September 30, 2016	Level 1		Level 2		Level 3		Total
Cash equivalents
Money market funds	$	12,041	$	—	$	—	$	12,041
Total assets	$	12,041	$	—	$	—	$	12,041



December 31, 2015
Cash equivalents
Money market funds	$	62,024	$	—	$	—	$	62,024
Total assets	$	62,024	$	—	$	—	$	62,024



September 30, 2015
Cash equivalents
Money market funds	$	50,006	$	—	$	—	$	50,006
Total assets	$	50,006	$	—	$	—	$	50,006

Schedule of Cash and Cash Equivalents [Table Text Block]

A reconciliation of cash equivalents to consolidated cash and cash equivalents is as follows:



(in thousands)	September 30, 2016		December 31, 2015		September 30, 2015
Cash equivalents	$	12,041	$	62,024	$	50,006
Cash	138,184		190,812		171,779
Total cash and cash equivalents	$	150,225	$	252,836	$	221,785

Fair Value Measurements, Nonrecurring [Table Text Block]

The carrying values and estimated fair values of our financial instruments that are not required to be recorded at fair value in the condensed consolidated balance sheets were as follows:



		September 30, 2016				December 31, 2015				September 30, 2015
(in thousands)	Fair Value Hierarchy	Carrying Value		Fair Value		Carrying Value		Fair Value		Carrying Value		Fair Value
Assets:
Held-to-maturity marketable securities	Level 1	$	107,771	$	107,770	$	105,695	$	105,336	$	88,253	$	88,313
Liabilities (including current maturities):
2019 Notes¹	Level 3	$	160,000	$	169,094	$	160,000	$	165,731	$	200,000	$	212,919
Credit Agreement loan¹	Level 3	96,250		96,151		100,000		99,375		70,000		69,753

¹The fair values of the 2019 Notes and Credit Agreement (defined in Note 10) are based on borrowing rates available to us for long-term debt with similar terms, average maturities, and credit risk.