Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement of Other Comprehensive Income [Abstract]
Net Earnings	$ 120,666	$ 173,043	$ 113,767
Foreign Currency Translation:
Foreign Currency Translation Adjustment	5	(343)	(648)
Less: Reclassification Adjustments for Net Gains Included in Net Earnings	0	373	0
Net Change	5	30	(648)
Available-for-Sale Investments:
Change in Net Unrealized Losses on Available-for-Sale Investments	0	0	88
Less: Reclassification Adjustment for Net Losses Included in Net Earnings	0	0	(88)
Net Change	0	0	0
Cash Flow Hedges:
Change in Net Unrealized Gains on Derivatives Designated as Cash Flow Hedges	0	0	(12)
Less: Reclassification Adjustment for Net Gains Included in Net Earnings	0	0	12
Net Change	0	0	0
Total Other Comprehensive Income (Loss)	5	30	(648)
Comprehensive Income	$ 120,671	$ 173,073	$ 113,119