Stockholders' Equity Schedule of Share-based Compensation Arrangements by Share-based Payment Award (Tables)

12 Months Ended

Dec. 31, 2016

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

A summary of option activity during the year ended December 31, 2016 is presented below: 

	December 31, 2016
	Shares		Weighted Average Exercise Price (per share)		Weighted Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value
	(in thousands, except exercise price and contractual terms)
Outstanding options, beginning of period	224		$	19.15
Granted	—		—
Exercised	(77	)	13.93
Forfeited or expired	(10	)	24.48
Options outstanding, end of period	137		$	21.70	6.76	$	3,704
Options exercisable, end of period	64		$	17.30	5.86	$	2,020
Options expected to vest, end of period	56		$	25.56	7.56	$	2,316

Schedule of Unvested Restricted Stock Units Roll Forward [Table Text Block]

A summary of the status of the Company’s unvested shares of restricted stock, including those issued in connection with the Bridge acquisition, and changes during the years then ended is presented below: 

	December 31,
	2016				2015
	Shares		Weighted Average Grant Date Fair Value		Shares		Weighted Average Grant Date Fair Value
	(in thousands, except per share amounts)
Balance, beginning of period	1,492		$	20.46	1,050		$	16.19
Granted	478		32.00		509		27.55
Issued in acquisition	—		—		546		14.70
Vested	(571	)	16.95		(528	)	13.02
Forfeited	(121	)	23.65		(85	)	21.63
Balance, end of period	1,278		$	26.02	1,492		$	20.46

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

Bridge's stock options had an original vesting period of four years and a contractual term of ten years. Stock option replacement awards were valued using the Black-Scholes option valuation model, using the following weighted average assumptions.

	June 30, 2015
Dividend yield	—		%
Volatility	33.96		%
Risk-free interest rate	2.11		%
Expected life in years	7.66
Weighted average fair value of assumed options	$	19.06