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Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Computation of basic and diluted net income per share [Abstract]
Numerator- net income	$ 50,674		$ 30,060
Denominator- weighted average shares
Basic (in shares)	67,864,475		67,200,480
Dilutive effect of stock compensation awards (in shares)	1,690,466	[1]	1,437,447	[1]
Diluted (in shares)	69,554,941		68,637,927
Net income per share
Net income per share, Basic (in dollars per share)	$ 0.75		$ 0.45
Net income per share, Diluted (in dollars per share)	$ 0.73		$ 0.44
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	250,000		350,000
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	60,000		190,000
[1] Excludes approximately 250,000 stock options and 60,000 shares of restricted stock for 2013 as the impact of such awards was anti-dilutive. Excludes approximately 350,000 stock options and 190,000 shares of restricted stock for 2012 as the impact of such awards was anti-dilutive.

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