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Summary of Significant Accounting Policies Net Income Per Share (Details) (USD $) Share data 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, Basic, by Common Class, Including Two Class Method [Line Items]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest									$ 104,342,000us-gaap_ProfitLoss	$ 38,165,000us-gaap_ProfitLoss	$ 271,804,000us-gaap_ProfitLoss
NET INCOME	13,790,000us-gaap_NetIncomeLoss	13,512,000us-gaap_NetIncomeLoss	78,901,000us-gaap_NetIncomeLoss	(1,861,000)us-gaap_NetIncomeLoss	14,536,000us-gaap_NetIncomeLoss	26,660,000us-gaap_NetIncomeLoss	9,238,000us-gaap_NetIncomeLoss	(12,269,000)us-gaap_NetIncomeLoss	101,420,000us-gaap_NetIncomeLoss	35,683,000us-gaap_NetIncomeLoss	271,804,000us-gaap_NetIncomeLoss
WEIGHTED AVERAGE NUMBER OF COMMON SHARES OUTSTANDING — BASIC									39,420	41,115	43,070
Weighted Average Number Diluted Shares Outstanding Adjustment									459	309	326
WEIGHTED AVERAGE NUMBER OF COMMON SHARES OUTSTANDING — DILUTED									39,879	41,424	43,396
NET INCOME PER COMMON SHARE — BASIC	$ 0.37us-gaap_EarningsPerShareBasic	$ 0.34us-gaap_EarningsPerShareBasic	$ 1.95us-gaap_EarningsPerShareBasic	$ (0.05)us-gaap_EarningsPerShareBasic	$ 0.35us-gaap_EarningsPerShareBasic	$ 0.65us-gaap_EarningsPerShareBasic	$ 0.22us-gaap_EarningsPerShareBasic	$ (0.30)us-gaap_EarningsPerShareBasic	$ 2.65us-gaap_EarningsPerShareBasic	$ 0.93us-gaap_EarningsPerShareBasic	$ 6.31us-gaap_EarningsPerShareBasic
Dilutive Securities, Effect on Basic Earnings Per Share									$ (0.03)us-gaap_DilutiveSecurities	$ 0.01us-gaap_DilutiveSecurities	$ (0.05)us-gaap_DilutiveSecurities
NET INCOME PER COMMON SHARE — DILUTED	$ 0.36us-gaap_EarningsPerShareDiluted	$ 0.34us-gaap_EarningsPerShareDiluted	$ 1.93us-gaap_EarningsPerShareDiluted	$ (0.05)us-gaap_EarningsPerShareDiluted	$ 0.35us-gaap_EarningsPerShareDiluted	$ 0.64us-gaap_EarningsPerShareDiluted	$ 0.22us-gaap_EarningsPerShareDiluted	$ (0.30)us-gaap_EarningsPerShareDiluted	$ 2.62us-gaap_EarningsPerShareDiluted	$ 0.92us-gaap_EarningsPerShareDiluted	$ 6.26us-gaap_EarningsPerShareDiluted
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount									4,000	4,000	4,000
Warrant [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Class of Warrant or Right, Outstanding	4,000				4,000				4,000	4,000	4,000
Employee Stock Option [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount									75	79	0