Equity-based Compensation (Tables)

12 Months Ended

Dec. 31, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Restricted Stock and Restricted Stock Units Activity

A summary of stock award activity is as follows:

	Years Ended December 31,
	2015				2014				2013
	Stock Awards		Weighted Average Award Date Fair Value		Stock Awards		Weighted Average Award Date Fair Value		Stock Awards		Weighted Average Award Date Fair Value
Outstanding, beginning of period	767,540		$	21.93	555,025		$	22.79	698,869		$	19.39
Restricted shares awarded	—		—		242,722		23.76		435,025		24.09
Restricted stock units awarded	719,305		17.32		395,352		21.75		112,401		25.11
Restricted shares distributed	(90,607	)	19.25		(118,828	)	23.55		(274,784	)	19.04
Restricted stock units distributed	(12,646	)	19.62		(15,277	)	21.25		(13,761	)	18.87
Restricted shares forfeited	(54,045	)	23.40		(104,013	)	23.77		(236,388	)	23.10
Restricted stock units forfeited	(53,840	)	19.14		(187,441	)	24.48		(166,337	)	19.55
Outstanding, end of period	1,275,707		$	19.60	767,540		$	21.93	555,025		$	22.79

Schedule of Deferred Stock Unit Activity

The following table summarizes information about deferred stock unit activity:

	Years Ended December 31,
	2015				2014				2013
	Deferred Stock Units		Weighted Average Award Date Fair Value		Deferred Stock Units		Weighted Average Award Date Fair Value		Deferred Stock Units		Weighted Average Award Date Fair Value
Outstanding, beginning of period	221,471		$	20.10	214,455		$	19.56	181,518		$	19.06
Awarded	53,527		18.56		38,810		22.89		39,966		22.33
Shares distributed	(27,779	)	18.76		(31,794	)	19.70		(7,029	)	22.67
Outstanding, end of period	247,219		$	19.92	221,471		$	20.10	214,455		$	19.56

Schedule of Stock Options Activity

A summary of stock option activity is as follows:

	Years Ended December 31,
	2015				2014				2013
	Shares		Weighted Average Exercise Price		Shares		Weighted Average Exercise Price		Shares		Weighted Average Exercise Price
Outstanding at January 1	503,134		$	18.18	1,208,824		$	18.54	1,216,809		$	18.46
Granted	—		—		38,820		24.21		29,025		25.11
Exercised	(209,205	)	13.13		(526,359	)	16.36		(29,511	)	20.14
Canceled/Expired	(5,546	)	24.21		(218,151	)	25.61		(7,499	)	24.58
Outstanding at December 31	288,383		$	21.73	503,134		$	18.18	1,208,824		$	18.54
Exercisable at December 31	284,929		$	21.78	452,236		$	18.12	933,738		$	17.84

Schedule Stock Option Exercises

Financial data for stock option exercises are summarized in the following table (in thousands):

	Years Ended December 31,
	2015		2014		2013
Amount collected from stock option exercises	$	2,748	$	8,614	$	738
Total intrinsic value of stock option exercises	1,108		3,771		131
Tax benefit of stock option exercises recorded in additional paid-in-capital	209		6		55
Aggregate intrinsic value of outstanding stock options	173		1,231		5,383
Aggregate intrinsic value of exercisable stock options	169		1,209		4,695

Schedule Valuation Assumptions

The fair value of stock options awarded during 2014 and 2013 was estimated at the date of grant based on the assumptions presented in the table below:

	Years Ended December 31,
	2014		2013
	Range	Weighted Average	Range	Weighted Average
Grant-date fair value	$11.27	$11.27	$12.92	$12.92
Volatility	41.6%	41.6%	49.8%	49.8%
Expected term (years)	7.0	7.0	7.0	7.0
Dividend yield	—%	—%	—%	—%
Risk-free rate	2.3%	2.3%	1.1%	1.1%