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Selected Quarterly Financial Data (Schedule Of Selected Quarterly Financial Data) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Selected Quarterly Financial Data [Abstract]
Consolidated revenue	$ 154,817	$ 135,717	$ 120,787	$ 102,079	$ 101,571	$ 90,532	$ 83,610	$ 77,920	$ 513,400	$ 353,633	$ 230,423
Gross profit	80,097	71,437	62,583	53,477	52,496	46,879	42,968	38,853	267,594	181,196	109,028
Total operating expenses	62,121	42,867	45,787	35,958	34,330	28,443	28,969	28,883	186,733	120,625	74,126
Income (loss) from operations	17,976	28,570	16,796	17,519	18,166	18,436	13,999	9,970	80,861	60,571	34,902
Income tax expense	5,248	8,279	4,791	1,569	(1,449)	2,752	1,935	1,100	19,887	4,338	(2,974)
Net income	$ 11,224	$ 17,640	$ 9,343	$ 5,883	$ 10,912	$ 13,517	$ 8,324	$ 6,188	$ 44,119	$ 38,941	$ 35,420
Basic and diluted net income per share	$ 0.11	$ 0.17	$ 0.10	$ 0.06	$ 0.13	$ 0.16	$ 0.11	$ 0.08	$ 0.45	$ 0.48	$ 0.47

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- Definition

The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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