Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Basic EPS:
Net Income (Loss)	$ (283,427)us-gaap_NetIncomeLoss	$ (2,442)us-gaap_NetIncomeLoss	$ 21,701us-gaap_NetIncomeLoss
Income, Share Amounts	43,795,000	43,331,000	42,840,000
Earnings Per Share, Basic	$ (6.47)us-gaap_EarningsPerShareBasic	$ (0.06)us-gaap_EarningsPerShareBasic	$ 0.51us-gaap_EarningsPerShareBasic
Dilutive Securities:
Dilutive Options, Shares	0	0	90,000
Dilutive RSA's, Shares	0	0	244,000
Diluted EPS:
Net Income (Loss) Available to Common Stockholders, Diluted	$ (283,427)	$ (2,442)	$ 21,701
Weighted Average Number of Shares Outstanding, Diluted	43,795,000	43,331,000	43,174,000
Earnings Per Share, Diluted	$ (6.47)us-gaap_EarningsPerShareDiluted	$ (0.06)us-gaap_EarningsPerShareDiluted	$ 0.50us-gaap_EarningsPerShareDiluted
Earnings Per Share (Textual) [Abstract]
Options to purchase, shares	1,332,190	1,488,314	1,585,594
Options to purchase, exercise price	$ 34.02	$ 33.38	$ 33.13
Stock Options [Member]
Earnings Per Share (Textual) [Abstract]
Antidilutive shares not included in the computation of diluted EPS	1,400,000	1,600,000	1,300,000
Restricted Stock Awards [Member]
Earnings Per Share (Textual) [Abstract]
Antidilutive shares not included in the computation of diluted EPS	500,000	300,000	300,000
Restricted Stock Units (RSUs) [Member]
Earnings Per Share (Textual) [Abstract]
Antidilutive shares not included in the computation of diluted EPS	400,000	300,000

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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