Debt (Details) (USD $)	3 Months Ended			3 Months Ended									0 Months Ended	156 Months Ended			0 Months Ended	3 Months Ended				3 Months Ended	0 Months Ended		3 Months Ended	0 Months Ended						0 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Mar. 31, 2014 Senior secured revolving credit facility [Member]	Mar. 03, 2014 Senior secured revolving credit facility [Member]	Mar. 03, 2014 Senior secured revolving credit facility [Member] Minimum [Member]	Mar. 03, 2014 Senior secured revolving credit facility [Member] Maximum [Member]	Mar. 03, 2014 Senior secured revolving credit facility [Member] Alternative Testing for Covenant [Member] Minimum [Member]	Mar. 31, 2014 Senior Notes [Member]	Mar. 11, 2010 Senior Notes [Member]	Mar. 31, 2014 Senior Notes, Issued [Member] Senior Notes [Member]	Dec. 31, 2013 Senior Notes, Issued [Member] Senior Notes [Member]	Mar. 11, 2010 Senior Notes, 2010 [Member]	Mar. 19, 2014 Senior Notes, 2014 [Member]	Mar. 18, 2014 Senior Notes, 2014 [Member]	Nov. 21, 2011 Senior Notes, 2014 [Member]	Nov. 21, 2011 Senior Notes, 2011 [Member]	Mar. 31, 2014 Senior Notes, 2010 and 2011 [Member]	Mar. 30, 2014 Senior Notes, 2010 and 2011 [Member]	Mar. 04, 2014 Senior Notes, 2010 and 2011 [Member]	Mar. 31, 2014 Senior Notes, 2010 and 2011 [Member] Senior Notes [Member]	Mar. 31, 2014 London Interbank Offered Rate (LIBOR) [Member] Senior secured revolving credit facility [Member]	Mar. 04, 2014 London Interbank Offered Rate (LIBOR) [Member] Senior secured revolving credit facility [Member] Minimum [Member]	Mar. 04, 2014 London Interbank Offered Rate (LIBOR) [Member] Senior secured revolving credit facility [Member] Maximum [Member]	Mar. 31, 2014 Prime Rate [Member] Senior secured revolving credit facility [Member]	Mar. 04, 2014 Prime Rate [Member] Senior secured revolving credit facility [Member] Minimum [Member]	Mar. 04, 2014 Prime Rate [Member] Senior secured revolving credit facility [Member] Maximum [Member]	May 02, 2014 Subsequent Event [Member] Senior Notes, 2010 and 2011 [Member]	Mar. 31, 2014 Redemption Prior to March 15, 2017 [Member] Senior Notes, 2014 [Member]	Mar. 18, 2014 Redemption Prior to March 15, 2017 [Member] Senior Notes, 2014 [Member]	Mar. 14, 2014 Redemption Prior to March 15, 2017 [Member] Senior Notes, 2014 [Member]	May 02, 2014 Debt Instrument, Redemption, Period One [Member] Subsequent Event [Member] Senior Notes, 2010 and 2011 [Member]	Apr. 02, 2014 Debt Instrument, Redemption, Period One [Member] Subsequent Event [Member] Senior Notes, 2010 and 2011 [Member]	Apr. 02, 2014 Debt Instrument, Redemption, Period One [Member] Restricted Cash [Member] Subsequent Event [Member] Senior Notes, 2010 and 2011 [Member]
Long-term Debt, by Current and Noncurrent [Abstract]
Long-term Debt	$ 703,299,000		$ 502,513,000								$ 621,588,000	$ 419,586,000									$ 321,600,000
Long-term Debt, Gross																					325,500,000
Line of Credit Facility [Abstract]
Line of Credit Facility, Maximum Borrowing Capacity					250,000,000
Debt Instrument, Basis Spread on Variable Rate																						2.75%	2.50%	3.25%	1.75%	1.50%	2.25%
Debt Instrument Stated Percentage of Outstanding Equity Interests of First Tier Foreign Subsidiaries That Secure Debt Obligations					65.00%
Line of Credit Facility, Amount Outstanding				80,000,000
Letters of Credit Outstanding, Amount				14,000,000
Line of Credit Facility, Remaining Borrowing Capacity				156,000,000
Ratio of Indebtedness to Net Capital				2.8
Ratio of Indebtedness to Net Capital, Senior				0.4
Ratio of Interest Coverage				5.3
Debt Instrument, Covenant Compliance, Ratio of Indebtedness to Net Capital							4.00
Debt Instrument, Covenant Compliance, Ratio of Indebtedness to Net Capital, Senior							2.50	2.00
Debt Instrument, Covenant Compliance, Ratio of Interest Coverage						2.50
Debt Instrument, Covenant Compliance, Ratio of Asset Coverage								1.00
Debt Instrument, Covenant Compliance, Line of Credit Facility, Remaining Borrowing Capacity After Capital Expenditures Adjustment To Avoid Future Capital Expenditures Restrictions								25,000,000
Debt Instrument, Covenant Compliance, Capital Expenditure Limitation Threshold, Ratio of Indebtedness to Net Capital, Senior							2.00
Capital Expenditure Limitation During Fiscal Year To Be Imposed If Covenant Noncompliance, Exceeding Stated Senior Consolidated Leverage Ratio				100,000,000
Capital Expenditure Limitation Maximum Amount Unused From Prior Fiscal Year Available to Increase Current Year Capital Expenditure Threshold If Restrictions Imposed Due to Noncompliance				30,000,000
Senior Notes [Abstract]
Debt Instrument, Face Amount													250,000,000		300,000,000		175,000,000	1,000	425,000,000
Debt Instrument, Interest Rate, Stated Percentage													9.875%		6.125%
Debt Instrument, Unamortized Discount									4,900,000				10,600,000
Debt Instrument, Interest Rate, Effective Percentage													10.677%				9.66%
Proceeds from Issuance of Debt													234,800,000	293,900,000			172,700,000
Deferred Finance Costs, Gross													4,600,000		6,100,000		4,100,000
Debt Instrument, Tender Offer, Principal Amount, Maximum																				300,000,000
Payments of Debt Extinguishment Costs	5,479,000	0
Debt Instrument, Repurchased Face Amount																		99,500,000
Debt Instrument, Repurchase Price, per $1,000 principal amount																		1,055.08
Debt Instrument, Unamortized Discount on Notes Tendered																		1,200,000
Unamortized Deferred Finance Costs on Notes Tendered																		1,200,000
Loss on extinguishment of debt	(7,887,000)	0																(7,900,000)										14,600,000
Debt Instrument, Actual Value to Face Value, Percentage													95.75%			100.00%	101.00%
Debt Instrument, Unamortized Premium									900,000								1,800,000
Debt Instrument, Face Amount, Remaining Balance related to Tender Offer																																	200,500,000
Debt Instrument Subject to Early Redemption, Percentage of Aggregate Principal Redeemable prior to March 15, 2017																														35.00%
Debt instrument, Redeemable with Debt Issuance Proceeds, Redemption Price, Percentage																															106.125%
Debt Instrument, Redeemable with Debt Issuance Proceeds, Minimum Percentage Outstanding After Redemption																													65.00%
Debt Instrument, Redemption Price, Percentage																																104.938%
Debt Instrument, Redemption, Value																																		210,401,000
Restricted Cash	210,401,000		0
Debt Instrument, Redeemable with Equity Issuance Proceeds, Required Repurchase Due to Change in Control Redemption Price, Percentage										101.00%
Debt Instrument, Redeemable with Equity Issuance Proceeds, Required Repurchase Due to Asset Disposition, Redemption Price, Percentage										100.00%
Deferred Finance Costs [Abstract]
Deferred Finance Costs, Net	11,800,000		7,500,000
Amortization of Financing Costs	$ 600,000	$ 500,000