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Earnings per Share (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Calculation of basic and diluted earnings per share
Net income	$ 16,727,000	$ 26,336,000
Basic weighted-average common shares outstanding	66,211	64,104
Add: dilutive effect of stock options, unvested RSUs, and contingent PSAs (in shares)	1,310	2,210
Add: dilutive effect of 3.50% Senior Convertible Notes	0	1,531
Diluted weighted-average common shares outstanding	67,521	67,845
Basic net income per common share	$ 0.25	$ 0.41
Diluted net income per common share	$ 0.25	$ 0.39
Performance Shares [Member]
Earnings per share
Performance period to receive awards (in years)	3
Common stock awards vesting multiplier, low end of range	0
Common stock awards vesting multiplier, high end of range	2
Convertible Debt [Member]
Earnings per share
Interest rate on notes (as a percent)	3.50%
Debt Instrument, Principal Amount Denominator for Conversion into Common Stock	$ 1,000
Common stock conversion price (in dollars per share)		$ 54.42

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