Stock-Based Compensation (Nonvested Stock Awards) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011 employee		Mar. 31, 2013 employee	Sep. 30, 2012 employee
Restricted stock and restricted stock units [Member]
Summary of nonvested stock awards granted
Number of Shares Granted (shares)	712,457
Weighted Average Grant Date Fair Value (usd per share)	$ 5.86		$ 7.64		$ 6.96
2008 Equity Incentive Plan [Member] | Stock options [Member]
Summary of nonvested stock awards granted
Vesting Period	3 years
Director Group 1 [Member]
Summary of nonvested stock awards granted
Vesting Period	1 year
Director Group 1 [Member] | Stock options [Member]
Summary of nonvested stock awards granted
Vesting Period	1 year or less		1 year or less		1 year or less
Weighted Average Grant Date Fair Value (usd per share)	$ 2.00		$ 3.89		$ 4.06
Director Group 1 [Member] | 2008 Equity Incentive Plan [Member] | Restricted stock and restricted stock units [Member]
Summary of nonvested stock awards granted
Number of Shares Granted (shares)	75,490		56,261		65,801
Vesting Period	1 year or less		1 year or less		1 year or less
Weighted Average Grant Date Fair Value (usd per share)	$ 5.67		$ 7.55		$ 7.23
Director [Member] | Stock options [Member]
Summary of nonvested stock awards granted
Vesting Period			3 years
Weighted Average Grant Date Fair Value (usd per share)			$ 4.25
Director [Member] | 2008 Equity Incentive Plan [Member] | Restricted stock and restricted stock units [Member]
Summary of nonvested stock awards granted
Number of Shares Granted (shares)			8,546
Vesting Period			3 years
Weighted Average Grant Date Fair Value (usd per share)			$ 7.72
Director [Member] | 2008 Equity Incentive Plan [Member] | Stock options [Member]
Summary of nonvested stock awards granted
Vesting Period	1 year
Director Group 2 [Member] | Stock options [Member]
Summary of nonvested stock awards granted
Vesting Period	3 years				3 years
Weighted Average Grant Date Fair Value (usd per share)	$ 3.76				$ 3.98
Director Group 2 [Member] | 2008 Equity Incentive Plan [Member] | Restricted stock and restricted stock units [Member]
Summary of nonvested stock awards granted
Number of Shares Granted (shares)	17,092				17,237
Vesting Period	3 years				3 years
Weighted Average Grant Date Fair Value (usd per share)	$ 6.83				$ 6.34
Employee Group 1 [Member]
Summary of nonvested stock awards granted
Vesting Period	3 years
Employee Group 1 [Member] | Stock options [Member]
Summary of nonvested stock awards granted
Vesting Period	3 years		3 years		2 years
Weighted Average Grant Date Fair Value (usd per share)	$ 2.48		$ 4.12		$ 3.72
Employee Group 1 [Member] | 2008 Equity Incentive Plan [Member] | Restricted stock and restricted stock units [Member]
Summary of nonvested stock awards granted
Number of Shares Granted (shares)	599,875		426,286		60,000
Vesting Period	3 years		3 years		2 years
Weighted Average Grant Date Fair Value (usd per share)	$ 5.82		$ 7.55		$ 6.09
Employee Group 2 [Member] | Stock options [Member]
Summary of nonvested stock awards granted
Vesting Period					3 years
Weighted Average Grant Date Fair Value (usd per share)					$ 4.33
Employee Group 2 [Member] | 2008 Equity Incentive Plan [Member] | Restricted stock and restricted stock units [Member]
Summary of nonvested stock awards granted
Number of Shares Granted (shares)					455,064
Vesting Period					3 years
Weighted Average Grant Date Fair Value (usd per share)					$ 7.41
Employee inducement [Member] | Restricted stock and restricted stock units [Member] | Minimum [Member]
Summary of nonvested stock awards granted
Vesting Period					3 years	[1]
Employee inducement [Member] | Restricted stock and restricted stock units [Member] | Maximum [Member]
Summary of nonvested stock awards granted
Vesting Period					4 years
Employee inducement [Member] | Stock options [Member]
Summary of nonvested stock awards granted
Vesting Period					3-4 years
Vesting Period	3 years	[2]	3 years	[1]
Weighted Average Grant Date Fair Value (usd per share)	$ 3.81	[2]	$ 4.58	[1]	$ 3.13
Number of employees					3		1	1
Employee inducement [Member] | Stock options [Member] | Minimum [Member]
Summary of nonvested stock awards granted
Vesting Period					3 years
Employee inducement [Member] | Stock options [Member] | Maximum [Member]
Summary of nonvested stock awards granted
Vesting Period					4 years
Employee inducement [Member] | 2008 Equity Incentive Plan [Member] | Restricted stock and restricted stock units [Member]
Summary of nonvested stock awards granted
Number of Shares Granted (shares)	20,000	[3]	45,000	[4]	120,000
Vesting Period					3-4 years
Vesting Period	3 years	[3]	3 years	[4]
Weighted Average Grant Date Fair Value (usd per share)	$ 7.14	[3]	$ 8.54	[4]	$ 5.66
Number of employees					2		1	1

[1] The Company granted non-qualified stock options outside its existing stock-based compensation plans in the third quarter of 2012 to one employee in connection with the employee joining the Company.

[2] The Company granted non-qualified performance-based stock options outside its existing stock-based compensation plans in the first quarter of 2013 to one employee in connection with the employee joining the Company.

[3] The Company granted nonvested performance-based stock awards (restricted stock) outside its existing stock-based compensation plans in the first quarter of 2013 to one employee in connection with the employee joining the Company.

[4] The Company granted nonvested stock awards (restricted stock units) outside its existing stock-based compensation plans in the third quarter of 2012 to one employee in connection with the employee joining the Company.