Stock Based Compensation (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012 Employees	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum shares of common stock provided		4,000,000
Vesting period of shares	4 years
Estimated fair value of options			$ 12.00
Additional general and administration expenses			$ 1,100,000
Number of options granted	874,000		0
Aggregate intrinsic value	13,300,000
Aggregate intrinsic value exercisable	900,000
Quoted closing market price	$ 18.64
Weighted average contractual term	5 years 11 months 19 days
Total intrinsic value of options exercised	36,000	900,000	200,000
Tax related benefits realized from the exercise of stock options	0	0	0
Stock-based compensation expense	3,897,000	140,000	2,406,000
Stock based long term liability	1,200,000	300,000	300,000
Stock based current liability	100,000	100,000	2,900,000
Liability based awards	0	0	100,000
Unrecognized compensation expense related to unvested stock options	4,100,000
Weighted average remaining requisite service period of unvested stock awards	1 year 10 months 24 days
Fair value of option shares vested	300,000	300,000	1,000,000
Restricted stock or unit expenses	1,618,000	758,000
Number of options, Options forfeited	(59,000)
Weighted average grant date fair value for options	$ 3.91	$ 5.95
Granted option share purchase price, per share	$ 8.78
Aggregate intrinsic value for the restricted stock and restricted stock units outstanding	14,000,000
Tax benefits recognized for stock based compensation	1,100,000	300,000	900,000
Number of employees		4
Aggregate amount of loan, secured		200,000
Loans granted prior to termination of loan program			0
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of shares	3 years
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of shares	4 years
Class A [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum shares that may be issued pursuant to options or restricted stock grants	3,481,569
Restricted stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of shares	3 years
Stock-based compensation expense	100,000	100,000	200,000
Weighted average remaining requisite service period of unvested stock awards	1 year 9 months 26 days
Defer issuance term	2 years
Vesting Period, beginning date	Mar. 19, 2012
Vesting period, end date	Apr. 15, 2015
Additional restricted stock vesting	116,841
Restricted stock grants		13,833
Restricted stock or unit expenses	1,600,000	700,000	44,000
Unrecognized compensation expense related to unvested restricted stock and restricted stock units	4,600,000
Fair value of restricted stock and restricted stock units vested	182,000	44,000	44,000
Restricted stock [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of shares	1 year	1 year
Restricted stock [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of shares	4 years	4 years
Restricted Stock Units Service Based [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value, usd per share	$ 10.79	$ 10.00
Restricted stock grants	17,000
Restricted stock grants	51,000	54,166
Weighted average fair value, Granted	$ 11.31	$ 10.04
Restricted Stock Units Performance Based [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum shares of common stock provided		116,841
Weighted average fair value, usd per share	$ 0.00	$ 0.00
Restricted stock grants	0
Restricted stock grants	0
Weighted average fair value, Granted	$ 0.00
Restricted Stock Performance Based [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value, usd per share	$ 13.24	$ 13.24
Restricted stock grants	0
Restricted stock grants	0
Weighted average fair value, Granted	$ 0.00
Restricted Stock Service Based [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value, usd per share	$ 9.43	$ 9.72
Restricted stock grants	1,000
Restricted stock grants	378,000	206,842	0
Weighted average fair value, Granted	$ 9.07	$ 9.66
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of shares	3 years
Maximum vesting period	5 years
Maximum vesting period	10 years
Stock-based compensation expense	$ 2,200,000	$ (700,000)	$ 2,100,000
Stock options [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of shares	3 years
Stock options [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of shares	4 years