Summary Of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Calculation of Basic and Diluted Earnings per Share

The following table sets forth the calculation of basic and diluted earnings (loss) per share.

			Year Ended December 31,
(in thousands, except per share data)			2017		2016		2015

Net income (loss)		$	(31,965)	$	64,047	$	95,401

Denominator for basic earnings per share – weighted-average number of
	common shares outstanding during the period		49,680		49,298		51,573
Incremental common shares attributable to exercise of dilutive options			—		313		318
Incremental common shares attributable to outstanding
	restricted stock units		—		214		197
Denominator for diluted earnings per share			49,680		49,825		52,088
Basic earnings (loss) per share			$ (0.64)		$ 1.30		$ 1.85
Diluted earnings (loss) per share			$ (0.64)		$ 1.29		$ 1.83

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

As of December 31, 2017, the unrecognized compensation cost and remaining weighted-average amortization related to stock-based awards were as follows:

				Performance-
				based
			Restricted	Restricted
		Stock	Stock	Stock
(in thousands)		Options	Units	Units⁽¹⁾
	Unrecognized compensation cost	$ 535	$ 10,738	$ 3,345
	Remaining weighted-average amortization period	0.6 years	2.2 years	1.8 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

The weighted-average assumptions used to value the options granted during the year ended December 31, 2015 were as follows:

(in thousands)
	Options granted	289
	Expected term of options	6.4 years
	Expected volatility	35%
	Risk-free interest rate	1.886%
	Dividend yield	zero