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Stock-Based Compensation Plans and Employee Benefits (Stock-based Compensation) (Details) (USD $)	3 Months Ended		6 Months Ended				6 Months Ended			1 Months Ended	6 Months Ended	1 Months Ended				1 Months Ended			1 Months Ended					1 Months Ended				6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	May 22, 2014 2013 Performance Incentive Plan [Member]	Jun. 30, 2014 Long-term Incentive Plan 2006 and 2009	Jun. 30, 2014 Employees Restricted stock units	Jun. 30, 2014 Employees Amended restricted stock units vesting on January 1, 2014	Jun. 30, 2014 Employees Service-based restricted stock units vesting on March 2014	Jan. 31, 2014 Employees Common Stock Subject to Sales Restriction [Member]	Jun. 30, 2014 Employees Common Stock Subject to Sales Restriction [Member]	Jan. 31, 2014 Employees Common Stock	Jan. 31, 2014 Employees Service-based restricted stock units	Jun. 30, 2014 Employees Service-based restricted stock units	Jan. 10, 2014 Employees Service-based restricted stock units	Jan. 31, 2014 Employees Performance-based restricted stock units vesting on December 31, 2016	Jun. 30, 2014 Employees Performance-based restricted stock units vesting on December 31, 2016	Jan. 10, 2014 Employees Performance-based restricted stock units vesting on December 31, 2016	Jan. 31, 2014 Employees Performance-based restricted stock units vesting on December 31, 2016 Minimum	Jan. 31, 2014 Employees Performance-based restricted stock units vesting on December 31, 2016 Maximum	Feb. 28, 2013 Employees Service-based restricted stock units vesting on February 1, 2016	Jun. 30, 2014 Employees Service-based restricted stock units vesting on February 1, 2016	Jun. 30, 2014 Employees Performance based restricted stock units vesting on December 31, 2014	Feb. 28, 2013 Employees Performance-based restricted stock units	Feb. 28, 2013 Employees Performance-based restricted stock units Minimum	Feb. 28, 2013 Employees Performance-based restricted stock units Maximum	Jun. 30, 2014 Employees Service based restricted stock units with specified vesting dates	Jun. 30, 2014 Employees Service based restricted stock units with specified vesting dates Minimum	Jun. 30, 2014 Company's chairman and chief executive officer Service-based restricted stock units vesting on June 15, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of Total Points Granted					73.00%
Percentage of Total Points					100.00%
Stock-based compensation expense	$ 3,196,000	$ 4,719,000	$ 5,271,000	$ 9,921,000
Unrecognized compensation cost	3,800,000		3,800,000
Weighted-average period to recognize the unrecognized compensation cost			1 year 3 months 18 days
Deferred compensation share-based arrangements, liability, current and noncurrent	$ 2,400,000		$ 2,400,000
Shares available for issuance						4,100,000
Vested (in shares)							2,336,053	1,696,053	40,000	229,235																			600,000
Restricted shares awarded							1,163,678				128,652
Non-vested, outstanding (in shares)														66,967			51,055					196,582	195,409				50,666
Vesting term													3 years								3 years							3 years
Sale restriction period												2 years
Granted units															67,637			51,726
Vesting percentage																			0.00%	200.00%					0.00%	200.00%
Risk-free interest rate																0.76%								0.26%
Expected stock price volatility																44.84%								50.44%

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Percentage of Total Points

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted, Number

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Sale Restriction Period

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of restricted shares issued as compensation, net of shares for the payment of withholding taxes. This element is to be used only if shares are used in lieu of cash to satisfy all or a portion of withholding taxes.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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