Stock-Based Compensation (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified	9 Months Ended	3 Months Ended		9 Months Ended		3 Months Ended				1 Months Ended	3 Months Ended		3 Months Ended			9 Months Ended				3 Months Ended
	Sep. 30, 2013 compensation_plan	Sep. 30, 2013 The Plans [Member]	Sep. 30, 2012 The Plans [Member]	Sep. 30, 2013 The Plans [Member]	Sep. 30, 2012 The Plans [Member]	Sep. 30, 2013 Employee Group [Member]	Sep. 30, 2012 Employee Group [Member]	Sep. 30, 2013 Director Group [Member]	Sep. 30, 2012 Director Group [Member]	Jun. 30, 2012 Performance Shares [Member] 2006 Management Incentive Plan [Member]	Sep. 30, 2013 Performance Shares [Member] 2006 Management Incentive Plan [Member] executive_officer	Jun. 19, 2012 Performance Shares [Member] 2006 Management Incentive Plan [Member]	Sep. 30, 2012 Restricted Stock and Restricted Stock Units [Member]	Sep. 30, 2013 Restricted Stock and Restricted Stock Units [Member] 2008 Equity Incentive Plan [Member]	Sep. 30, 2012 Restricted Stock and Restricted Stock Units [Member] Employee Group [Member] 2008 Equity Incentive Plan [Member]	Sep. 30, 2013 Restricted Stock and Restricted Stock Units [Member] Employee Group [Member] 2008 Equity Incentive Plan [Member]	Sep. 30, 2012 Restricted Stock and Restricted Stock Units [Member] Employee Group [Member] 2008 Equity Incentive Plan [Member]	Sep. 30, 2013 Restricted Stock and Restricted Stock Units [Member] Director Group [Member] 2008 Equity Incentive Plan [Member]	Sep. 30, 2012 Restricted Stock and Restricted Stock Units [Member] Director Group [Member] 2008 Equity Incentive Plan [Member]	Sep. 30, 2013 Restricted Stock and Restricted Stock Units [Member] Director [Member] 2008 Equity Incentive Plan [Member]	Sep. 30, 2013 Stock Options [Member] 2008 Equity Incentive Plan [Member]	Sep. 30, 2012 Stock Options [Member] 2008 Equity Incentive Plan [Member]	Sep. 30, 2013 Stock Options [Member] Employee [Member] 2008 Equity Incentive Plan [Member]	Sep. 30, 2013 Stock Options [Member] Director [Member] 2008 Equity Incentive Plan [Member]
Stock-Based Compensation (Textual) [Abstract]
Number of stock-based compensation plans	3
Stock options expiration period																					7 years
Stock options vesting period						3 years	3 years		1 year							3 years	3 years			1 year			3 years	1 year
Stock options award vesting right														vest in equal annual increments over the vesting period							vest in equal annual increments over the vesting period
No. of Options Granted (shares)						449,875		75,490														0
No. of Shares Granted (shares)													0		597,250	449,875	426,286	75,490	51,276
Total of performance units were outstanding and fully vested (shares)											85,406	154,264
Grant date fair value awards										$ 1.2
Percentage of performance units (percent)											60.00%
Percentage of fair market value (percent)											40.00%
Performance units settled in period (shares)											52,334
Number of executive officers that settled performance units in period (executive officers)											5
Number of former executive officers that settled performance units in period (executive officers)											1
Perfomance units forfeited in period (shares)											16,524
Number of former executive officers that forfeited performance units in period (executive officer)											1
Common stock issued during period (shares)											31,399
Cash payments for shares settled during period											0.1
Selling, general and administrative expenses		1.3	1.8	3.8	4.5
Unrecognized stock-based compensation expense related to stock options		$ 8.1		$ 8.1
Weighted-average period for recognizing stock compensation expense		1 year 11 months 20 days