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Stock-based Compensation: Incentive Award Plan and Employee Stock Purchase Plan Stock-based Compensation: Incentive Award Plan and Employee Stock Purchase Plan (Tables)

12 Months Ended

Dec. 31, 2013

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

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

The following table displays the weighted average assumptions that have been applied to estimate the fair value of stock option awards on the date of grant. During 2013, the Company did not grant any stock option awards.

		Year Ended December 31,
		2012			2011
Dividend yield		—			—
Risk-free interest rate		1.19	%		0.92	%
Expected volatility		64.15	%		75.67	%
Expected lives		7.3 years			3.6 years

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

The following summarizes pricing and term information for options outstanding as of December 31, 2013:

										Options Outstanding											Options Exercisable
										Number Outstanding at			Weighted Average Remaining Contractual Life (years)		Weighted Average Exercise Price						Number Exercisable at			Weighted Average Exercise Price
Range of Exercise Prices										December 31, 2013											December 31, 2013
$	4.44			─		$	8.26			255,250			4.8			$	6.62				214,351				$	6.34
8.38				─		11.39				272,121			5.1			10.90					196,831				11.08
11.56				─		12.90				213,724			3.1			12.39					213,724				12.39
13.31				─		13.58				43,850			3.3			13.32					43,006				13.31
16.51				─		16.51				75,000			8.7			16.51					23,437				16.51
$	4.44			─		$	16.51			859,945			4.8			$	10.61				691,349				$	10.34

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

The following table is a summary of stock option activity under the Plan as of December 31, 2013 and changes for the year then ended:

		Incentive Stock Options		Non- Qualified Stock Options		Weighted Average Exercise Price Per Share				Weighted Average Remaining Contractual Term (Years)				Aggregate Intrinsic Value
Outstanding at January 1, 2013		129,423		1,156,937		$	9.83				5.6			$	13,442,000
Exercised		(59,806)		(333,377)		$	8.13
Canceled		(201)		(33,031)		$	9.65
Outstanding at December 31, 2013		69,416		790,529		$	10.61				4.8			$	20,903,000
Vested and Expected to Vest at December 31, 2013		69,416		772,942		$	10.56				4.7			$	20,521,000
Exercisable at December 31, 2013		69,386		621,963		$	10.34				4.0			$	16,995,000

Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]

Restricted Stock Units and Restricted Stock Awards

A summary of the status of the Company’s unvested RSUs as of December 31, 2013 and changes during the year then ended are presented below:

		Restricted Stock Units / Awards			Weighted Average Grant-Date Fair Value Per Unit / Award
Unvested RSUs outstanding at January 1, 2013		1,390,834				$	14.31
Granted		621,262				26.77
Market value share count adjustment for liability awards		(55,664	)			34.92
Vested		(538,525	)			14.76
Forfeited		(50,669	)			15.75
Unvested RSUs outstanding at December 31, 2013		1,367,238				$	18.90
Unvested and expected to vest RSUs outstanding at December 31, 2013		1,201,190				$	19.12

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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms.

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Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year.

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