Share-Based Compensation (Details 2) (USD $)	3 Months Ended						0 Months Ended		3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Options	Mar. 31, 2013 Options	Mar. 31, 2014 RSUs	Mar. 31, 2013 RSUs	Mar. 12, 2014 Director options	Feb. 18, 2014 2003 Incentive Plan Chairman, Chief Executive Officer, and President Common Stock	Mar. 31, 2014 2003 Incentive Plan Chairman, Chief Executive Officer, and President Common Stock	Mar. 31, 2013 2003 Incentive Plan Chairman, Chief Executive Officer, and President Common Stock
Shares Under Options
Outstanding at the beginning of the period (in shares)			467,500
Granted (in shares)			577				577
Exercised (in shares)			(100,678)
Outstanding at the end of the period (in shares)			367,399
Exercisable at the end of the period (in shares)			286,150
Vested and expected to vest at the end of the period (in shares)			367,399
Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)			$ 9.00
Granted (in dollars per share)			$ 25.48				$ 25.48
Exercised (in dollars per share)			$ 2.82
Outstanding at the end of the period (in dollars per share)			$ 10.72
Exercisable at the end of the period (in dollars per share)			$ 8.53
Vested and expected to vest at the end of the period (in dollars per share)			$ 10.72
Weighted Average Remaining Contractual Life
Outstanding at the end of the period			3 years 10 months 2 days
Exercisable at the end of the period			3 years 10 months 13 days
Vested and expected to vest at the end of the period			3 years 10 months 2 days
Aggregate Intrinsic Value
Outstanding at the end of the period			$ 5,013,000
Exercisable at the end of the period			4,532,000
Vested and expected to vest at the end of the period			5,013,000
Assumptions used to determine the intrinsic fair market value of options using Black Scholes option pricing model
Expected volatility (as a percent)			38.00%
Risk free interest rate (as a percent)			0.70%
Expected term			5 years
Weighted average grant date fair value of options granted (in dollars per share)			$ 8.67
The total intrinsic value of all options exercised			2,300,000	100,000
Restricted Stock Units
Unvested at the beginning of the period (in shares)					50,900
Awards								400,000
Awarded (in shares)					21,660
Shares vested (in shares)					(30,253)
Unvested at the end of the period (in shares)					42,307
Weighted Average Award Date Fair Value
Unvested at the beginning of the period (in dollars per share)					$ 11.94
Awarded (in dollars per share)					$ 25.97
Shares vested (in dollars per share)					$ 10.11
Unvested at the end of the period (in dollars per share)					$ 12.04
Additional share-based compensation disclosures
Total amount of consideration received from the exercised options			284,000	31,000
Compensation expense	265,000	179,000	94,000	25,000	66,000	54,000			100,000	100,000
Net-share settlement (in shares)			17,233		9,878	22,089
Net-share settlement, market price per share					$ 25.88	$ 19.29
Unrecognized compensation expense	$ 911,000
Weighted average period of recognition of unrecognized compensation expense	4 years
Shares surrendered in lieu of payment of exercise price and withholding taxes			25,094
Shares surrendered in lieu of payment of exercise price of awards			7,861
Average market price of shares surrendered in lieu of payment of exercise price and withholding taxes (in dollars per share)			$ 25.84