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Shareholders' Equity (Details 5) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Sep. 21, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Noncash share-based compensation expense		$ 3,125,000	$ 2,586,000	$ 1,079,000
Class A common shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Noncash share-based compensation expense				$ 300,000
Share-based compensation (in shares)		30,281
Repurchase of Class A common stock, authorized amount					$ 300,000,000
Weighted-average price of shares (in dollars per share)		$ 15.76
Total cost of Class A common shares		$ 57,300,000
Remaining repurchase authorization amount		$ 242,700,000
Stock options
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Total unrecognized compensation cost			$ 6,000,000
Weighted-average period of unvested cost		1 year 11 months 27 days
Stock options | Class A common shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Share-based compensation (in shares)				19,500
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Restricted stock units at beginning of period (in shares)	85,000	85,000	0	0
Units awarded (in shares)		44,000	92,000	0
Units released (in shares)		(22,000)	0	0
Units forfeited (in shares)		(15,350)	(7,000)	0
Restricted stock units at end of the period (in shares)		91,650	85,000	0
Total unrecognized compensation cost			$ 1,100,000
Weighted-average period of unvested cost		2 years 4 months 24 days
Stock options and Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Noncash share-based compensation expense		$ 3,100,000	$ 2,600,000	$ 800,000
Common Stock | Class A common shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Share-based compensation (in shares)				19,500
Repurchase of Class A common shares (in shares)	3,633,602	3,633,602

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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