Summary Of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2014

Accounting Policies [Abstract]

Schedule Of Long-Term Investments Measured At Fair Value Using Significant Unobservable Inputs (Level 3 Inputs)

(in thousands)		2014		2013
Balance as of January 1	$	9,921	$	10,324
Net unrealized gains included in other comprehensive income		1,369		418
Sales of investments at par value		(10,282)		(821)
Balance as of December 31	$	1,008	$	9,921
Unrealized losses still held as of December 31	$	64	$	1,433

Schedule Of Calculation Of Basic And Diluted Earnings Per Share

			Year Ended December 31,
(in thousands, except per share data)			2014		2013		2012
Net income		$	82,442	$	111,159	$	56,607
Denominator for basic earnings per share – weighted-
	average number of common shares outstanding
	during the period		53,538		54,213		56,320
Incremental common shares attributable to exercise of
	dilutive options		450		324		150
Incremental common shares attributable to outstanding
	restricted shares and restricted stock units		234		242		164
Denominator for diluted earnings per share			54,222		54,779		56,634
Basic earnings per share		$	1.54	$	2.05	$	1.01
Diluted earnings per share		$	1.52	$	2.03	$	1.00

Schedule Of Unrecognized Compensation Cost And Remaining Weighted-Average Amortization Stock-Based Awards

								Performance-
								based
						Restricted		Restricted
		Stock		Restricted		Stock		Stock
(in thousands)		Options		Shares		Units		Units(1)
Unrecognized compensation cost	$	4,380	$	817	$	5,996	$	1,742
Remaining weighted-average
amortization period		1.6 years		0.8 years		2.5 years		2.2 years
(1) Based on the probable achievement of the performance goals identified in each award.

Summary Of Weighted-Average Assumptions Used To Value Option Grants

		Year Ended December 31,
(in thousands)		2014	2013	2012
	Options granted	378	348	432
	Expected term of options	7.0 years	7.4 years	6.3 years
	Expected volatility	39%	42%	42%
	Risk-free interest rate	2.081%	1.396%	1.305%
	Dividend yield	zero	zero	zero