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

12 Months Ended

Dec. 31, 2015

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, 2015 is presented below: 

	December 31, 2015
	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	217		$	9.70
Granted	—		—
Issued in acquisition of Bridge	213		22.02
Exercised	(182	)	10.62
Forfeited or expired	(24	)	23.89
Options outstanding, end of period	224		$	19.15	6.41	$	3,738
Options exercisable, end of period	94		$	11.72	3.67	$	2,278
Options expected to vest, end of period	97		$	24.49	8.38	$	1,691

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,
	2015				2014
	Shares		Weighted Average Grant Date Fair Value		Shares		Weighted Average Grant Date Fair Value
	(in thousands, except per share amounts)
Balance, beginning of period	1,050		$	16.19	1,204		$	9.71
Granted	509		27.55		508		23.90
Issued in acquisition of Bridge	546		14.70		—		—
Vested	(528	)	13.02		(566	)	9.57
Forfeited	(85	)	21.63		(96	)	15.05
Balance, end of period	1,492		$	20.46	1,050		$	16.19

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