Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Net Earnings	$ 49,243us-gaap_NetIncomeLoss	$ 38,339us-gaap_NetIncomeLoss
Other Comprehensive Income (Loss):
Foreign Currency Translation Adjustment	3	(4)
Total Other Comprehensive Income (Loss)	3	(4)
Comprehensive Income	$ 49,246us-gaap_ComprehensiveIncomeNetOfTax	$ 38,335us-gaap_ComprehensiveIncomeNetOfTax

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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