Equity-Based Compensation Plans (Details Textual) (USD $)	9 Months Ended					0 Months Ended	9 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended																					3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Stock option grants in 2011 and 2012 [Member]	Sep. 30, 2013 Stock option grants in 2006 through 2010 [Member]	Sep. 30, 2013 Employee Stock Option Market vesting feature [Member]	May 09, 2013 Employee Stock Option [Member]	Sep. 30, 2013 Employee Stock Option [Member]	Sep. 30, 2012 Employee Stock Option [Member]	Sep. 30, 2013 Performance Shares [Member]	Sep. 30, 2012 Performance Shares [Member]	Sep. 30, 2013 Performance Cash Award [Member]	Sep. 30, 2012 Performance Cash Award [Member]	Sep. 30, 2013 Performance Cash Award [Member]	Sep. 30, 2012 Performance Cash Award [Member]	Sep. 30, 2013 Performance Cash Award 2013 [Member]	Sep. 30, 2013 Restricted Stock [Member]	Sep. 30, 2012 Restricted Stock [Member]	Sep. 30, 2013 Restricted Stock Units R S U [Member]	Sep. 30, 2012 Restricted Stock Units R S U [Member]	Sep. 30, 2013 Employee Stock [Member]	Sep. 30, 2013 Maximum [Member]	Sep. 30, 2012 Maximum [Member]	Sep. 30, 2013 Maximum [Member] Employee Stock Option Market vesting feature [Member]	Sep. 30, 2013 Maximum [Member] Performance Cash Award 2013 [Member]	Sep. 30, 2013 Maximum [Member] Restricted Stock [Member]	Sep. 30, 2013 Minimum [Member]	Sep. 30, 2012 Minimum [Member]	Sep. 30, 2013 Minimum [Member] Employee Stock Option Market vesting feature [Member]	Sep. 30, 2013 Minimum [Member] Performance Cash Award 2013 [Member]	Sep. 30, 2013 Minimum [Member] Restricted Stock [Member]	Sep. 30, 2013 Market Vesting Feature Stock Price Threshold 1 [Member] Employee Stock Option Market vesting feature [Member]	Sep. 30, 2013 Market Vesting Feature Stock Price Threshold 2 [Member] Employee Stock Option Market vesting feature [Member]	Sep. 30, 2013 Market Vesting Feature Stock Price Threshold 3 [Member] Employee Stock Option Market vesting feature [Member]	Sep. 30, 2013 Selling, General and Administrative Expenses [Member]	Sep. 30, 2012 Selling, General and Administrative Expenses [Member]	Sep. 30, 2013 Selling, General and Administrative Expenses [Member]	Sep. 30, 2012 Selling, General and Administrative Expenses [Member]
Equity-Based Compensation Plans (Textual) [Abstract]
Equity-based compensation expense	$ 5,984,000	$ 5,722,000																																$ 2,000,000	$ 2,300,000	$ 6,000,000	$ 5,700,000
Stock option vesting Period																									5 years
Number of Options, Granted					375,000		642,700
Market condition target																															$ 14	$ 16	$ 18
Weighted average fair value of options granted	$ 10.74	$ 8.46																					$ 5.87					$ 5.22
Expected volatility					67.00%																79.00%	65.00%				76.00%	64.00%
Risk-free interest rate					0.60%																0.54%	0.95%				0.29%	0.77%
Expected dividend yield	0.00%	0.00%			0.00%
Requisite Service Period									3 years						3 years															3 years
Stock option vesting rights			three-year period	four-year period
Intrinsic value of options		0					400,000
Unrecognized compensation expense							4,300,000	3,200,000
Compensation expense recognized over a weighted-average period							1 year 6 months		4 months	1 year 2 months			1 year 8 months			2 years 2 months	2 years 7 months
Options, vested in period, fair value							2,800,000
Additional shares authorized						1,600,000
Unrecognized compensation cost total									400,000	2,000,000	2,800,000		2,800,000			5,800,000	4,900,000
Intrinsic Value of restricted stock awards																7,864,528
Number of shares of common stock available for issuance																		650,000
Deferred Compensation Arrangement with Individual, Common Stock Reserved for Future Issuance																		225,639
Stock & Deferred Compensation Plan for Non-Employee																		48,894
Weighted-average fair value																		$ 11.04
Approximate cash payment to each non-employee for insufficient deferred stock units																			28,100
Share units outstanding under the plan																		313,974
Percent of fair market value for shares purchased under the Company's ESPP																				85.00%
Offering Period of Employee Stock Purchase Plan																				3 months
Stock issued under ESPP																				217,230
Discount percent of company issued common stock under its ESPP																				15.00%
Authorization of additional shares under ESPP											$ 800,000	$ 400,000	$ 1,700,000	$ 1,100,000
Share Based Compensation Arrangement by Share Based Payment Award Equity Instrument Other Than Option Stock Issuance Percentage Multiplier																								240.00%					0.00%