Stock-Based Compensation (Details) (USD $) In Thousands, except Share data, unless otherwise specified	7 Months Ended	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2012
Summary of stock option transactions and related information
Options, Outstanding, Beginning Balance		819,928
Options, Outstanding, Weighted Average Exercise Price, Beginning Balance		$ 29.11
Options, Outstanding, Weighted Average Remaining Contractual Life-Years, Beginning Balance		7 years 7 months 6 days
Options, Granted		385,600
Weighted Average Exercise Price, Granted		$ 47.35
Options, Exercised	0	(106,255)
Weighted Average Exercise Price, Exercised		$ 25.52
Options, Forfeited		(15,500)
Weighted Average Exercise Price, Forfeited		$ 39.52
Options, Outstanding, Ending Balance		1,083,773
Options, Outstanding, Weighted Average Exercise Price, Ending Balance		$ 35.81
Options, Outstanding, Weighted Average Remaining Contractual Life-Years, Ending Balance		7 years 7 months 6 days
Options, Outstanding, Aggregate Intrinsic Value, Ending Balance		$ 2,378
Options, Exercisable, Number		202,955
Options, Exercisable, Weighted Average Exercise Price		$ 26.26
Options, Exercisable, Weighted Average Remaining Contractual Life-Years		7 years 6 months
Options, Exercisable, Aggregate Intrinsic Value		$ 2,383