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Earnings Per Share (Schedule of Earnings Per Share Basic and Diluted) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share [Abstract]
Net Income (Loss) Attributable to Parent	$ 191,091us-gaap_NetIncomeLoss	$ 157,996us-gaap_NetIncomeLoss	$ 198,296us-gaap_NetIncomeLoss	$ 136,664us-gaap_NetIncomeLoss	$ 144,959us-gaap_NetIncomeLoss	$ 137,955us-gaap_NetIncomeLoss	$ (49,612)us-gaap_NetIncomeLoss	$ 185,535us-gaap_NetIncomeLoss	$ 684,047us-gaap_NetIncomeLoss	$ 418,837us-gaap_NetIncomeLoss	$ 631,893us-gaap_NetIncomeLoss
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Weighted Average Number of Shares Outstanding, Basic									69,248us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	71,917us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	73,737us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Equivalent shares from outstanding stock options									714us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	544us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	416us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Weighted Average Number of Shares Outstanding, Diluted									69,962us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	72,461us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	74,153us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Earnings per share
Earnings Per Share, Basic (in dollars per share)	$ 2.78us-gaap_EarningsPerShareBasic	$ 2.30us-gaap_EarningsPerShareBasic	$ 2.87us-gaap_EarningsPerShareBasic	$ 1.94us-gaap_EarningsPerShareBasic	$ 2.05us-gaap_EarningsPerShareBasic	$ 1.95us-gaap_EarningsPerShareBasic	$ (0.69)us-gaap_EarningsPerShareBasic	$ 2.51us-gaap_EarningsPerShareBasic	$ 9.88us-gaap_EarningsPerShareBasic	$ 5.82us-gaap_EarningsPerShareBasic	$ 8.57us-gaap_EarningsPerShareBasic
Earnings Per Share, Diluted (in dollars per share)	$ 2.75us-gaap_EarningsPerShareDiluted	$ 2.28us-gaap_EarningsPerShareDiluted	$ 2.84us-gaap_EarningsPerShareDiluted	$ 1.92us-gaap_EarningsPerShareDiluted	$ 2.03us-gaap_EarningsPerShareDiluted	$ 1.93us-gaap_EarningsPerShareDiluted	$ (0.69)us-gaap_EarningsPerShareDiluted	$ 2.49us-gaap_EarningsPerShareDiluted	$ 9.78us-gaap_EarningsPerShareDiluted	$ 5.78us-gaap_EarningsPerShareDiluted	$ 8.52us-gaap_EarningsPerShareDiluted

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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