Earnings Per Share (Computation of Basic and Diluted) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Numerator:
Income (loss) from continuing operations, net of tax	$ 13,572	$ 59,124	$ 26,132	$ 63,955
Denominator:
Denominator for basic earnings per share - Weighted-average shares (shares)	17,244,831	16,484,957	17,141,672	16,342,289
Effect of dilutive stock options (shares)	618,000	539,000	570,000	561,000
Denominator for diluted earnings per share - Adjusted weighted-average shares and assumed conversions (shares)	17,863,035	17,024,137	17,711,972	16,903,224
Basic income (loss) per share (dollars per share)	$ 0.79	$ 3.59	$ 1.52	$ 3.91
Diluted income (loss) per share (dollars per share)	$ 0.76	$ 3.47	$ 1.48	$ 3.78