Stock-Based Compensation (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified	6 Months Ended	3 Months Ended		6 Months Ended									0 Months Ended	1 Months Ended	6 Months Ended		24 Months Ended	6 Months Ended
	Jun. 30, 2014 compensation_plan	Jun. 30, 2014 The Plans [Member]	Jun. 30, 2013 The Plans [Member]	Jun. 30, 2014 The Plans [Member]	Jun. 30, 2013 The Plans [Member]	Jun. 30, 2014 Employee Group [Member]	Jun. 30, 2014 Employee Group [Member] 2008 Equity Incentive Plan [Member]		Jun. 30, 2013 Employee Group [Member] 2008 Equity Incentive Plan [Member]	Jun. 30, 2014 Director Group [Member]	Jun. 30, 2014 Director Group [Member] 2008 Equity Incentive Plan [Member]	Jun. 30, 2013 Director Group [Member] 2008 Equity Incentive Plan [Member]	Jun. 19, 2012 Performance Shares [Member] 2006 Management Incentive Plan [Member] officer	Jun. 30, 2012 Performance Shares [Member] 2006 Management Incentive Plan [Member]	Jun. 30, 2014 Performance Shares [Member] 2006 Management Incentive Plan [Member] executive_officer	Jun. 30, 2013 Performance Shares [Member] 2006 Management Incentive Plan [Member]	Jun. 30, 2014 Performance Shares [Member] 2006 Management Incentive Plan [Member] executive_officer officer	Jun. 30, 2014 Restricted Stock and Restricted Stock Units [Member]	Jun. 30, 2014 Restricted Stock and Restricted Stock Units [Member] 2008 Equity Incentive Plan [Member]	Jun. 30, 2014 Restricted Stock and Restricted Stock Units [Member] Employee Group [Member] 2008 Equity Incentive Plan [Member]	Jun. 30, 2013 Restricted Stock and Restricted Stock Units [Member] Employee Group [Member] 2008 Equity Incentive Plan [Member]	Jun. 30, 2014 Restricted Stock and Restricted Stock Units [Member] Director Group [Member] 2008 Equity Incentive Plan [Member]	Jun. 30, 2013 Restricted Stock and Restricted Stock Units [Member] Director Group [Member] 2008 Equity Incentive Plan [Member]	Jun. 30, 2014 Restricted Stock and Restricted Stock Units [Member] Director [Member] 2008 Equity Incentive Plan [Member]	Jun. 30, 2014 Stock Options [Member] 2008 Equity Incentive Plan [Member]	Jun. 30, 2013 Stock Options [Member] 2008 Equity Incentive Plan [Member]	Jun. 30, 2014 Stock Options [Member] 2008 Equity Incentive Plan [Member] Minimum [Member]	Jun. 30, 2014 Stock Options [Member] 2008 Equity Incentive Plan [Member] Maximum [Member]	Jun. 30, 2014 Stock Options [Member] 2008 Equity Incentive Plan [Member]	Jun. 30, 2014 Stock Options [Member] Director [Member] 2008 Equity Incentive Plan [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Number of Officers													7
Stock-Based Compensation (Textual) [Abstract]
Number of shares granted																		0		120,000	438,625	51,276	75,490
Number of stock-based compensation plans	3
Stock options expiration period																											6 years	7 years
Stock options vesting period						3 years	3 years	[1]	3 years	1 year			3 years							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
Number of stock options granted (shares)							1,480,000	[1]	438,625		51,276	75,490														0
Total of performance units were outstanding and fully vested (shares)													154,264		22,038		22,038
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)															22,038	52,334	115,702
Number of executive officers that settled performance units in period (executive officers)																	4
Number of former executive officers that settled performance units in period (executive officers)																	2
Performance 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)															13,222	31,399	69,419
Cash payments for shares settled during period															0.1	0.1	0.2
Selling, general and administrative expenses		1.0	1.2	2.0	2.5
Unrecognized stock-based compensation expense related to stock options		$ 7.7		$ 7.7
Weighted-average period for recognizing stock compensation expense				2 years 4 months 1 day

[1] (1)The exercise price for these options is $6.36 for the options that vest on June 27, 2015, $6.99 for the options that vest on June 27, 2016 and $7.63 for the options that vest on June 27, 2017.