Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net Earnings	$ 173,043	$ 113,767	$ 118,376
Foreign Currency Translation:
Foreign Currency Translation Adjustment	(343)	(648)	935
Less: Reclassification Adjustments for Net Gains Included in Net Earnings	373
Net Change	30	(648)	935
Available-for-Sale Investments:
Change in Net Unrealized Losses on Available-for-Sale Investments		88
Less: Reclassification Adjustment for Net Losses Included in Net Earnings		(88)
Net Change
Cash Flow Hedges:
Change in Net Unrealized Gains on Derivatives Designated as Cash Flow Hedges		(12)	12
Less: Reclassification Adjustment for Net Gains Included in Net Earnings		12
Net Change			12
Total Other Comprehensive Income (Loss)	30	(648)	947
Comprehensive Income	$ 173,073	$ 113,119	$ 119,323