Fair Value Measurement (Tables)

3 Months Ended

Mar. 31, 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
March 31, 2016	Level 1		Level 2		Level 3		Total
Cash equivalents
Money market funds	$	46,094	$	—	$	—	$	46,094
Total assets	$	46,094	$	—	$	—	$	46,094



	Fair Value Measurement at Reporting Date Using
December 31, 2015	Level 1		Level 2		Level 3		Total
Cash equivalents
Money market funds	$	62,024	$	—	$	—	$	62,024
Total assets	$	62,024	$	—	$	—	$	62,024



	Fair Value Measurement at Reporting Date Using
March 31, 2015	Level 1		Level 2		Level 3		Total
Cash equivalents
Money market funds	$	54,709	$	—	$	—	$	54,709
Total assets	$	54,709	$	—	$	—	$	54,709

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)	March 31, 2016		December 31, 2015		March 31, 2015
Cash equivalents	$	46,094	$	62,024	$	54,709
Cash	152,204		190,812		184,694
Total cash and cash equivalents	$	198,298	$	252,836	$	239,403

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 are as follows:



		March 31, 2016				December 31, 2015				March 31, 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	$	115,654	$	115,692	$	105,695	$	105,336	$	99,804	$	99,811
Liabilities (including current maturities):
2019 Notes¹	Level 3	$	160,000	$	169,744	$	160,000	$	165,731	$	200,000	$	222,973
Credit Agreement loan¹	Level 3	98,750		99,316		100,000		99,375		70,000		70,391

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