Stock-Based Compensation Plans (Incentive Plans Narrative) (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Expense	$ 15,003,000	$ 9,437,000	$ 7,548,000
Directors' Plan
Plan Description	As of December 31, 2014, the Company has five equity incentive plans: the 1994 Nonemployee Directors' Stock Option Plan (the Directors' Plan), the 1998 Stock Option Plan (the 1998 Plan), the 2005 Omnibus Incentive Plan (the 2005 Plan), the 2014 Omnibus Equity Compensation Plan (the 2014 Plan), and the Employee Stock Purchase Plan ("ESPP"). These plans provide that in the event of certain change in control transactions, including a merger or consolidation in which the Company is not the surviving corporation or a reorganization in which more than fifty-percent (50%) of the shares of the Company's common stock entitled to vote are exchanged, all outstanding, unvested equity awards under these plans will vest, and in the case of stock options, will become immediately exercisable. As of December 31, 2014, there are no shares reserved for future grant under the Directors' Plan, the 1998 Plan and the 2005 Plan. As of December 31, 2014, there are 6,504,764 shares reserved for future grant under the 2014 Plan. The Company's 2014 Plan provides for the grant of nonqualified stock options, incentive stock options, stock appreciation rights, restricted stock, restricted stock units, performance shares, performance units, cash-based awards, dividend equivalents and other stock-based awards. Under the Company's 2014 Plan, the exercise price of stock options, the grant price of stock appreciation rights and the initial value of performance awards, will not be less than the fair market value of the Company's common stock on the date of award. Stock options generally vest 25% after year one and 6.25% every three months thereafter. Under the Company's 2005 Plan, the exercise price of stock options, the grant price of stock appreciation rights and the initial value of performance awards, must be equal to at least 100% of the fair market value of the Company's common stock on the date of grant. Stock options generally vest 28% after year one and 2% per month thereafter or 25% after year one and 6.25% every three months thereafter. Under the Company's 1998 Plan, the exercise price of options is not less than the fair market value of the Company's common stock on the date of grant. The number of shares, terms, and exercise period are determined by the board of directors on a grant-by-grant basis, and the exercise period does not extend beyond ten years from the date of the grant. Stock options generally vest 28% after one year and 2% or 3% per month thereafter or 25% after year one and 6.25% every three months thereafter. During the year ended December 31, 2010, the Company's Board of Directors awarded a total of 1,130,700 performance condition options to certain of the Company's employees. Vesting of these options are subject to the Company achieving certain performance criteria established at the grant date and the individuals fulfilling a service condition (continued employment). As of December 31, 2014, the performance criteria of 884,590 of these options had been satisfied and these options will become exercisable based on the following vesting schedule: 25% on each of the first four anniversaries of the date of grant, which was February 20, 2010 (the date of grant). The Company recognized $192,000, $277,000 and $1.1 million of compensation expense during the years ended December 31, 2014, 2013 and 2012, respectively, related to these options. The final performance criteria had not been met and therefore the remaining 246,110 options have been forfeited. The Company utilized the Black-Scholes option pricing model to determine the grant date fair value of the awards.
Number of Shares Reserved for Future Issuance	0
1998 Plan
Plan Description	As of December 31, 2014, the Company has five equity incentive plans: the 1994 Nonemployee Directors' Stock Option Plan (the Directors' Plan), the 1998 Stock Option Plan (the 1998 Plan), the 2005 Omnibus Incentive Plan (the 2005 Plan), the 2014 Omnibus Equity Compensation Plan (the 2014 Plan), and the Employee Stock Purchase Plan ("ESPP"). These plans provide that in the event of certain change in control transactions, including a merger or consolidation in which the Company is not the surviving corporation or a reorganization in which more than fifty-percent (50%) of the shares of the Company's common stock entitled to vote are exchanged, all outstanding, unvested equity awards under these plans will vest, and in the case of stock options, will become immediately exercisable. As of December 31, 2014, there are no shares reserved for future grant under the Directors' Plan, the 1998 Plan and the 2005 Plan. As of December 31, 2014, there are 6,504,764 shares reserved for future grant under the 2014 Plan. The Company's 2014 Plan provides for the grant of nonqualified stock options, incentive stock options, stock appreciation rights, restricted stock, restricted stock units, performance shares, performance units, cash-based awards, dividend equivalents and other stock-based awards. Under the Company's 2014 Plan, the exercise price of stock options, the grant price of stock appreciation rights and the initial value of performance awards, will not be less than the fair market value of the Company's common stock on the date of award. Stock options generally vest 25% after year one and 6.25% every three months thereafter. Under the Company's 2005 Plan, the exercise price of stock options, the grant price of stock appreciation rights and the initial value of performance awards, must be equal to at least 100% of the fair market value of the Company's common stock on the date of grant. Stock options generally vest 28% after year one and 2% per month thereafter or 25% after year one and 6.25% every three months thereafter. Under the Company's 1998 Plan, the exercise price of options is not less than the fair market value of the Company's common stock on the date of grant. The number of shares, terms, and exercise period are determined by the board of directors on a grant-by-grant basis, and the exercise period does not extend beyond ten years from the date of the grant. Stock options generally vest 28% after one year and 2% or 3% per month thereafter or 25% after year one and 6.25% every three months thereafter.
Number of Shares Reserved for Future Issuance	0
Share-based Compensation Expense	$ 192,000	$ 277,000	$ 1,100,000
2005 Plan
Number of Shares Reserved for Future Issuance	6,504,764
ESPP
Plan Description	As of December 31, 2014, the Company has five equity incentive plans: the 1994 Nonemployee Directors' Stock Option Plan (the Directors' Plan), the 1998 Stock Option Plan (the 1998 Plan), the 2005 Omnibus Incentive Plan (the 2005 Plan), the 2014 Omnibus Equity Compensation Plan (the 2014 Plan), and the Employee Stock Purchase Plan ("ESPP"). These plans provide that in the event of certain change in control transactions, including a merger or consolidation in which the Company is not the surviving corporation or a reorganization in which more than fifty-percent (50%) of the shares of the Company's common stock entitled to vote are exchanged, all outstanding, unvested equity awards under these plans will vest, and in the case of stock options, will become immediately exercisable. On May 19, 2010, the shareholders approved an ESPP whereby qualified employees are allowed to purchase limited amounts of the Company's common stock at the lesser of 85% of the market price at the beginning or end of the offering period. The shareholders have authorized 500,000 shares for purchase by employees. During the years ended December 31, 2014, 2013 and 2012, employees purchased 40,120, 72,937 and 45,553 shares, respectively, under the ESPP. The Company has 289,465 shares available for future purchase as of December 31, 2014. The Company estimates expected volatility considering implied volatility based on market-traded options on the Company's common stock and historical volatility of the Company's common stock over the expected life of the options. In estimating volatility for the years ended December 31, 2014, 2013 and 2012 the Company weighted implied volatility at zero percent and historical volatility at 100%. The Company recognizes compensation cost for awards on a straight-line basis over the requisite service period for the entire award. Additionally, the Company's policy is to issue new shares of common stock to satisfy stock option exercises, ESPP purchases or grants of restricted shares or deferred stock units.
Number of Shares Authorized	500,000
Number of Shares Reserved for Future Issuance	289,465
Shares of Stock Issued under plan	40,120	72,937	45,553

Stock-Based Compensation Plans (Incentive Plans Narrative) (Details) (USD $)

12 Months Ended

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Share-based Compensation Expense

As of December 31, 2014, the Company has five equity incentive plans: the 1994 Nonemployee Directors' Stock Option Plan (the Directors' Plan), the 1998 Stock Option Plan (the 1998 Plan), the 2005 Omnibus Incentive Plan (the 2005 Plan), the 2014 Omnibus Equity Compensation Plan (the 2014 Plan), and the Employee Stock Purchase Plan ("ESPP"). These plans provide that in the event of certain change in control transactions, including a merger or consolidation in which the Company is not the surviving corporation or a reorganization in which more than fifty-percent (50%) of the shares of the Company's common stock entitled to vote are exchanged, all outstanding, unvested equity awards under these plans will vest, and in the case of stock options, will become immediately exercisable.

As of December 31, 2014, there are no shares reserved for future grant under the Directors' Plan, the 1998 Plan and the 2005 Plan. As of December 31, 2014, there are 6,504,764 shares reserved for future grant under the 2014 Plan. The Company's 2014 Plan provides for the grant of nonqualified stock options, incentive stock options, stock appreciation rights, restricted stock, restricted stock units, performance shares, performance units, cash-based awards, dividend equivalents and other stock-based awards. Under the Company's 2014 Plan, the exercise price of stock options, the grant price of stock appreciation rights and the initial value of performance awards, will not be less than the fair market value of the Company's common stock on the date of award. Stock options generally vest 25% after year one and 6.25% every three months thereafter. Under the Company's 2005 Plan, the exercise price of stock options, the grant price of stock appreciation rights and the initial value of performance awards, must be equal to at least 100% of the fair market value of the Company's common stock on the date of grant. Stock options generally vest 28% after year one and 2% per month thereafter or 25% after year one and 6.25% every three months thereafter. Under the Company's 1998 Plan, the exercise price of options is not less than the fair market value of the Company's common stock on the date of grant. The number of shares, terms, and exercise period are determined by the board of directors on a grant-by-grant basis, and the exercise period does not extend beyond ten years from the date of the grant. Stock options generally vest 28% after one year and 2% or 3% per month thereafter or 25% after year one and 6.25% every three months thereafter.

During the year ended December 31, 2010, the Company's Board of Directors awarded a total of 1,130,700 performance condition options to certain of the Company's employees. Vesting of these options are subject to the Company achieving certain performance criteria established at the grant date and the individuals fulfilling a service condition (continued employment). As of December 31, 2014, the performance criteria of 884,590 of these options had been satisfied and these options will become exercisable based on the following vesting schedule: 25% on each of the first four anniversaries of the date of grant, which was February 20, 2010 (the date of grant). The Company recognized $192,000, $277,000 and $1.1 million of compensation expense during the years ended December 31, 2014, 2013 and 2012, respectively, related to these options. The final performance criteria had not been met and therefore the remaining 246,110 options have been forfeited. The Company utilized the Black-Scholes option pricing model to determine the grant date fair value of the awards.

Number of Shares Reserved for Future Issuance

1998 Plan

Plan Description

Number of Shares Reserved for Future Issuance

Share-based Compensation Expense

Number of Shares Reserved for Future Issuance

6,504,764

ESPP

Plan Description

On May 19, 2010, the shareholders approved an ESPP whereby qualified employees are allowed to purchase limited amounts of the Company's common stock at the lesser of 85% of the market price at the beginning or end of the offering period. The shareholders have authorized 500,000 shares for purchase by employees. During the years ended December 31, 2014, 2013 and 2012, employees purchased 40,120, 72,937 and 45,553 shares, respectively, under the ESPP. The Company has 289,465 shares available for future purchase as of December 31, 2014.

The Company estimates expected volatility considering implied volatility based on market-traded options on the Company's common stock and historical volatility of the Company's common stock over the expected life of the options. In estimating volatility for the years ended December 31, 2014, 2013 and 2012 the Company weighted implied volatility at zero percent and historical volatility at 100%. The Company recognizes compensation cost for awards on a straight-line basis over the requisite service period for the entire award. Additionally, the Company's policy is to issue new shares of common stock to satisfy stock option exercises, ESPP purchases or grants of restricted shares or deferred stock units.

Number of Shares Authorized

500,000

Number of Shares Reserved for Future Issuance

289,465

Shares of Stock Issued under plan

General descriptive information regarding an arrangement under which employees and directors receive: (a) awards of equity shares, equity share options, or other equity instruments; or (b) the entity incurs liabilities to them: (1) in amounts based, at least in part, on the price of the entity's shares or other equity instruments; or (2) that require or may require settlement by issuance of the entity's shares. Such an arrangement is usually provided to employees and directors to compensate them, provide performance incentives to them, and to attract or retain their services. May also include pertinent information particular to a plan that is not elsewhere specified in the taxonomy.

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