Stock-Based Compensation (Schedule of Restricted Stock Unit Activity) (Details) (Restricted stock units [Member], USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	9 Months Ended
	Mar. 31, 2014	Sep. 30, 2014
Restricted stock units [Member]
Number of Shares
Granted and unvested, beginning of period (in shares)	361,668	361,668
Vested (in shares)		(251,668)
Granted (in shares)		876,500
Forfeited (in shares)		(20,000)
Total granted and unvested (in shares)		966,500
Approved for grant (in shares)		401,000
Total awarded and unvested, end of period (in shares)		1,367,500
Weighted Average Grant Date Fair Value
Total Granted and Unvested, beginning of period, weighted average grant date fair value (in dollars per share)	$ 17.30	$ 17.30
Vested, weighted average grant date fair value (in dollars per share)		$ 17.27
Granted, weighted average grant date fair value (in dollars per share)	$ 27.33	$ 27.39
Forfeited, weighted average grant date fair value (in dollars per share)		$ 24.77
Total Granted and Unvested, end of period, weighted average grant date fair value (in dollars per share)		$ 26.30
Aggregate Intrinsic Value
Granted and Unvested, beginning of period, aggregate intrinsic value	$ 9,512	$ 9,512
Vested, aggregate intrinsic value		7,291
Granted, aggregate intrinsic value		23,140
Total Granted and Unvested, aggregate intrinsic value		25,516
Approved for grant, aggregate intrinsic value		10,586
Total Awarded and Unvested, end of period, aggregate intrinsic value		$ 36,102