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Selected Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2013

Quarterly Financial Information Disclosure [Abstract]

Summary of Selected Quarterly Financial Data

The following table sets forth the selected quarterly financial data for each of the quarters in 2013 (in thousands, except per share amounts):


		Quarter Ended
		March 31, 2013				June 30, 2013				September 30, 2013				December 31, 2013
Year Ended December 31, 2013:
Revenue		$	768,980			$	836,685			$	882,981			$	885,252
Gross margin			87,338				95,473				93,124				95,088
Operating income			24,737				30,464				31,295				27,251
Net income			15,364				18,610				18,600				16,536
Basic earnings per share		$	0.42			$	0.50			$	0.50			$	0.45
Diluted earnings per share		$	0.42			$	0.50			$	0.50			$	0.45

The following table sets forth the selected quarterly financial data for each of the quarters in 2012 (in thousands, except per share amounts):


		Quarter Ended
		March 31, 2012				June 30, 2012				September 30, 2012				December 31, 2012
Year Ended December 31, 2012:
Revenue		$	739,885			$	778,312			$	804,888			$	801,023
Gross margin			83,742				87,358				91,587				93,379
Operating income			22,511				27,850				30,351				31,648
Net income			13,662				16,952				18,495				18,844
Basic earnings per share		$	0.37			$	0.46			$	0.50			$	0.51
Diluted earnings per share		$	0.37			$	0.46			$	0.50			$	0.51